Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3252 insertions, 0 deletions

diff --git a/widget/android/nsWindow.cpp b/widget/android/nsWindow.cpp
new file mode 100644
index 0000000000..0c9fa562a4
--- /dev/null
+++ b/widget/android/nsWindow.cpp
@@ -0,0 +1,3252 @@
+/* -*- Mode: c++; c-basic-offset: 2; tab-width: 4; indent-tabs-mode: nil; -*-
+ * vim: set sw=2 ts=4 expandtab:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <algorithm>
+#include <atomic>
+#include <android/log.h>
+#include <android/native_window.h>
+#include <android/native_window_jni.h>
+#include <math.h>
+#include <queue>
+#include <type_traits>
+#include <unistd.h>
+
+#include "AndroidGraphics.h"
+#include "AndroidBridge.h"
+#include "AndroidBridgeUtilities.h"
+#include "AndroidCompositorWidget.h"
+#include "AndroidContentController.h"
+#include "AndroidUiThread.h"
+#include "AndroidView.h"
+#include "gfxContext.h"
+#include "GeckoEditableSupport.h"
+#include "GeckoViewOutputStream.h"
+#include "GeckoViewSupport.h"
+#include "GLContext.h"
+#include "GLContextProvider.h"
+#include "JavaBuiltins.h"
+#include "JavaExceptions.h"
+#include "KeyEvent.h"
+#include "MotionEvent.h"
+#include "ScopedGLHelpers.h"
+#include "ScreenHelperAndroid.h"
+#include "TouchResampler.h"
+#include "WidgetUtils.h"
+#include "WindowRenderer.h"
+
+#include "mozilla/EventForwards.h"
+#include "nsAppShell.h"
+#include "nsContentUtils.h"
+#include "nsFocusManager.h"
+#include "nsGkAtoms.h"
+#include "nsGfxCIID.h"
+#include "nsIDocShellTreeOwner.h"
+#include "nsLayoutUtils.h"
+#include "nsNetUtil.h"
+#include "nsPrintfCString.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsThreadUtils.h"
+#include "nsUserIdleService.h"
+#include "nsViewManager.h"
+#include "nsWidgetsCID.h"
+#include "nsWindow.h"
+
+#include "nsIWidgetListener.h"
+#include "nsIWindowWatcher.h"
+#include "nsIAppWindow.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/MiscEvents.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_android.h"
+#include "mozilla/StaticPrefs_ui.h"
+#include "mozilla/TouchEvents.h"
+#include "mozilla/WeakPtr.h"
+#include "mozilla/WheelHandlingHelper.h"  // for WheelDeltaAdjustmentStrategy
+#include "mozilla/a11y/SessionAccessibility.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/BrowserHost.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/MouseEventBinding.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/DataSurfaceHelpers.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/gfx/Swizzle.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/ipc/Shmem.h"
+#include "mozilla/java/EventDispatcherWrappers.h"
+#include "mozilla/java/GeckoAppShellWrappers.h"
+#include "mozilla/java/GeckoEditableChildWrappers.h"
+#include "mozilla/java/GeckoResultWrappers.h"
+#include "mozilla/java/GeckoSessionNatives.h"
+#include "mozilla/java/GeckoSystemStateListenerWrappers.h"
+#include "mozilla/java/PanZoomControllerNatives.h"
+#include "mozilla/java/SessionAccessibilityWrappers.h"
+#include "mozilla/java/SurfaceControlManagerWrappers.h"
+#include "mozilla/jni/NativesInlines.h"
+#include "mozilla/layers/APZEventState.h"
+#include "mozilla/layers/APZInputBridge.h"
+#include "mozilla/layers/APZThreadUtils.h"
+#include "mozilla/layers/CompositorBridgeChild.h"
+#include "mozilla/layers/CompositorOGL.h"
+#include "mozilla/layers/CompositorSession.h"
+#include "mozilla/layers/LayersTypes.h"
+#include "mozilla/layers/UiCompositorControllerChild.h"
+#include "mozilla/layers/IAPZCTreeManager.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/widget/AndroidVsync.h"
+#include "mozilla/widget/Screen.h"
+
+#define GVS_LOG(...) MOZ_LOG(sGVSupportLog, LogLevel::Warning, (__VA_ARGS__))
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::layers;
+using namespace mozilla::widget;
+using namespace mozilla::ipc;
+
+using mozilla::dom::ContentChild;
+using mozilla::dom::ContentParent;
+using mozilla::gfx::DataSourceSurface;
+using mozilla::gfx::IntSize;
+using mozilla::gfx::Matrix;
+using mozilla::gfx::SurfaceFormat;
+using mozilla::java::GeckoSession;
+using mozilla::java::sdk::IllegalStateException;
+using GeckoPrintException = GeckoSession::GeckoPrintException;
+static mozilla::LazyLogModule sGVSupportLog("GeckoViewSupport");
+
+// All the toplevel windows that have been created; these are in
+// stacking order, so the window at gTopLevelWindows[0] is the topmost
+// one.
+static nsTArray<nsWindow*> gTopLevelWindows;
+
+static bool sFailedToCreateGLContext = false;
+
+// Multitouch swipe thresholds in inches
+static const double SWIPE_MAX_PINCH_DELTA_INCHES = 0.4;
+static const double SWIPE_MIN_DISTANCE_INCHES = 0.6;
+
+static const double kTouchResampleVsyncAdjustMs = 5.0;
+
+static const int32_t INPUT_RESULT_UNHANDLED =
+    java::PanZoomController::INPUT_RESULT_UNHANDLED;
+static const int32_t INPUT_RESULT_HANDLED =
+    java::PanZoomController::INPUT_RESULT_HANDLED;
+static const int32_t INPUT_RESULT_HANDLED_CONTENT =
+    java::PanZoomController::INPUT_RESULT_HANDLED_CONTENT;
+static const int32_t INPUT_RESULT_IGNORED =
+    java::PanZoomController::INPUT_RESULT_IGNORED;
+
+static const nsCString::size_type MAX_TOPLEVEL_DATA_URI_LEN = 2 * 1024 * 1024;
+
+// Unique ID given to each widget, to identify it for the
+// CompositorSurfaceManager.
+static std::atomic<int32_t> sWidgetId{0};
+
+namespace {
+template <class Instance, class Impl>
+std::enable_if_t<jni::detail::NativePtrPicker<Impl>::value ==
+                     jni::detail::NativePtrType::REFPTR,
+                 void>
+CallAttachNative(Instance aInstance, Impl* aImpl) {
+  Impl::AttachNative(aInstance, RefPtr<Impl>(aImpl).get());
+}
+
+template <class Instance, class Impl>
+std::enable_if_t<jni::detail::NativePtrPicker<Impl>::value ==
+                     jni::detail::NativePtrType::OWNING,
+                 void>
+CallAttachNative(Instance aInstance, Impl* aImpl) {
+  Impl::AttachNative(aInstance, UniquePtr<Impl>(aImpl));
+}
+
+template <class Lambda>
+bool DispatchToUiThread(const char* aName, Lambda&& aLambda) {
+  if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
+    uiThread->Dispatch(NS_NewRunnableFunction(aName, std::move(aLambda)));
+    return true;
+  }
+  return false;
+}
+}  // namespace
+
+namespace mozilla {
+namespace widget {
+
+using WindowPtr = jni::NativeWeakPtr<GeckoViewSupport>;
+
+/**
+ * PanZoomController handles its native calls on the UI thread, so make
+ * it separate from GeckoViewSupport.
+ */
+class NPZCSupport final
+    : public java::PanZoomController::NativeProvider::Natives<NPZCSupport> {
+  WindowPtr mWindow;
+  java::PanZoomController::NativeProvider::WeakRef mNPZC;
+
+  // Stores the returnResult of each pending motion event between
+  // HandleMotionEvent and FinishHandlingMotionEvent.
+  std::queue<std::pair<uint64_t, java::GeckoResult::GlobalRef>>
+      mPendingMotionEventReturnResults;
+
+  RefPtr<AndroidVsync> mAndroidVsync;
+  TouchResampler mTouchResampler;
+  int mPreviousButtons = 0;
+  bool mListeningToVsync = false;
+
+  // Only true if mAndroidVsync is non-null and the resampling pref is set.
+  bool mTouchResamplingEnabled = false;
+
+  template <typename Lambda>
+  class InputEvent final : public nsAppShell::Event {
+    java::PanZoomController::NativeProvider::GlobalRef mNPZC;
+    Lambda mLambda;
+
+   public:
+    InputEvent(const NPZCSupport* aNPZCSupport, Lambda&& aLambda)
+        : mNPZC(aNPZCSupport->mNPZC), mLambda(std::move(aLambda)) {}
+
+    void Run() override {
+      MOZ_ASSERT(NS_IsMainThread());
+
+      JNIEnv* const env = jni::GetGeckoThreadEnv();
+      const auto npzcSupportWeak = GetNative(
+          java::PanZoomController::NativeProvider::LocalRef(env, mNPZC));
+      if (!npzcSupportWeak) {
+        // We already shut down.
+        env->ExceptionClear();
+        return;
+      }
+
+      auto acc = npzcSupportWeak->Access();
+      if (!acc) {
+        // We already shut down.
+        env->ExceptionClear();
+        return;
+      }
+
+      auto win = acc->mWindow.Access();
+      if (!win) {
+        // We already shut down.
+        env->ExceptionClear();
+        return;
+      }
+
+      nsWindow* const window = win->GetNsWindow();
+      if (!window) {
+        // We already shut down.
+        env->ExceptionClear();
+        return;
+      }
+
+      window->UserActivity();
+      return mLambda(window);
+    }
+
+    bool IsUIEvent() const override { return true; }
+  };
+
+  class MOZ_HEAP_CLASS Observer final : public AndroidVsync::Observer {
+   public:
+    static Observer* Create(jni::NativeWeakPtr<NPZCSupport>&& aNPZCSupport) {
+      return new Observer(std::move(aNPZCSupport));
+    }
+
+   private:
+    // Private constructor, part of a strategy to make sure
+    // we're only able to create these on the heap.
+    explicit Observer(jni::NativeWeakPtr<NPZCSupport>&& aNPZCSupport)
+        : mNPZCSupport(std::move(aNPZCSupport)) {}
+
+    void OnVsync(const TimeStamp& aTimeStamp) override {
+      auto accessor = mNPZCSupport.Access();
+
+      if (!accessor) {
+        return;
+      }
+
+      accessor->mTouchResampler.NotifyFrame(
+          aTimeStamp -
+          TimeDuration::FromMilliseconds(kTouchResampleVsyncAdjustMs));
+      accessor->ConsumeMotionEventsFromResampler();
+    }
+
+    void Dispose() override { delete this; }
+
+    jni::NativeWeakPtr<NPZCSupport> mNPZCSupport;
+  };
+
+  Observer* mObserver = nullptr;
+
+  template <typename Lambda>
+  void PostInputEvent(Lambda&& aLambda) {
+    // Use priority queue for input events.
+    nsAppShell::PostEvent(
+        MakeUnique<InputEvent<Lambda>>(this, std::move(aLambda)));
+  }
+
+ public:
+  typedef java::PanZoomController::NativeProvider::Natives<NPZCSupport> Base;
+
+  NPZCSupport(WindowPtr aWindow,
+              const java::PanZoomController::NativeProvider::LocalRef& aNPZC)
+      : mWindow(aWindow), mNPZC(aNPZC) {
+#if defined(DEBUG)
+    auto win(mWindow.Access());
+    MOZ_ASSERT(!!win);
+#endif  // defined(DEBUG)
+
+    // Use vsync for touch resampling on API level 19 and above.
+    // See gfxAndroidPlatform::CreateGlobalHardwareVsyncSource() for comparison.
+    if (jni::GetAPIVersion() >= 19) {
+      mAndroidVsync = AndroidVsync::GetInstance();
+    }
+  }
+
+  ~NPZCSupport() {
+    if (mListeningToVsync) {
+      MOZ_RELEASE_ASSERT(mAndroidVsync);
+      mAndroidVsync->UnregisterObserver(mObserver, AndroidVsync::INPUT);
+      mListeningToVsync = false;
+    }
+  }
+
+  using Base::AttachNative;
+  using Base::DisposeNative;
+
+  void OnWeakNonIntrusiveDetach(already_AddRefed<Runnable> aDisposer) {
+    RefPtr<Runnable> disposer = aDisposer;
+    // There are several considerations when shutting down NPZC. 1) The
+    // Gecko thread may destroy NPZC at any time when nsWindow closes. 2)
+    // There may be pending events on the Gecko thread when NPZC is
+    // destroyed. 3) mWindow may not be available when the pending event
+    // runs. 4) The UI thread may destroy NPZC at any time when GeckoView
+    // is destroyed. 5) The UI thread may destroy NPZC at the same time as
+    // Gecko thread trying to destroy NPZC. 6) There may be pending calls
+    // on the UI thread when NPZC is destroyed. 7) mWindow may have been
+    // cleared on the Gecko thread when the pending call happens on the UI
+    // thread.
+    //
+    // 1) happens through OnWeakNonIntrusiveDetach, which first notifies the UI
+    // thread through Destroy; Destroy then calls DisposeNative, which
+    // finally disposes the native instance back on the Gecko thread. Using
+    // Destroy to indirectly call DisposeNative here also solves 5), by
+    // making everything go through the UI thread, avoiding contention.
+    //
+    // 2) and 3) are solved by clearing mWindow, which signals to the
+    // pending event that we had shut down. In that case the event bails
+    // and does not touch mWindow.
+    //
+    // 4) happens through DisposeNative directly.
+    //
+    // 6) is solved by keeping a destroyed flag in the Java NPZC instance,
+    // and only make a pending call if the destroyed flag is not set.
+    //
+    // 7) is solved by taking a lock whenever mWindow is modified on the
+    // Gecko thread or accessed on the UI thread. That way, we don't
+    // release mWindow until the UI thread is done using it, thus avoiding
+    // the race condition.
+
+    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
+      auto npzc = java::PanZoomController::NativeProvider::GlobalRef(mNPZC);
+      if (!npzc) {
+        return;
+      }
+
+      uiThread->Dispatch(
+          NS_NewRunnableFunction("NPZCSupport::OnWeakNonIntrusiveDetach",
+                                 [npzc, disposer = std::move(disposer)] {
+                                   npzc->SetAttached(false);
+                                   disposer->Run();
+                                 }));
+    }
+  }
+
+  const java::PanZoomController::NativeProvider::Ref& GetJavaNPZC() const {
+    return mNPZC;
+  }
+
+ public:
+  void SetIsLongpressEnabled(bool aIsLongpressEnabled) {
+    RefPtr<IAPZCTreeManager> controller;
+
+    if (auto window = mWindow.Access()) {
+      nsWindow* gkWindow = window->GetNsWindow();
+      if (gkWindow) {
+        controller = gkWindow->mAPZC;
+      }
+    }
+
+    if (controller) {
+      controller->SetLongTapEnabled(aIsLongpressEnabled);
+    }
+  }
+
+  int32_t HandleScrollEvent(int64_t aTime, int32_t aMetaState, float aX,
+                            float aY, float aHScroll, float aVScroll) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    RefPtr<IAPZCTreeManager> controller;
+
+    if (auto window = mWindow.Access()) {
+      nsWindow* gkWindow = window->GetNsWindow();
+      if (gkWindow) {
+        controller = gkWindow->mAPZC;
+      }
+    }
+
+    if (!controller) {
+      return INPUT_RESULT_UNHANDLED;
+    }
+
+    ScreenPoint origin = ScreenPoint(aX, aY);
+
+    if (StaticPrefs::ui_scrolling_negate_wheel_scroll()) {
+      aHScroll = -aHScroll;
+      aVScroll = -aVScroll;
+    }
+
+    ScrollWheelInput input(
+        nsWindow::GetEventTimeStamp(aTime), nsWindow::GetModifiers(aMetaState),
+        ScrollWheelInput::SCROLLMODE_SMOOTH,
+        ScrollWheelInput::SCROLLDELTA_PIXEL, origin, aHScroll, aVScroll, false,
+        // XXX Do we need to support auto-dir scrolling
+        // for Android widgets with a wheel device?
+        // Currently, I just leave it unimplemented. If
+        // we need to implement it, what's the extra work
+        // to do?
+        WheelDeltaAdjustmentStrategy::eNone);
+
+    APZEventResult result = controller->InputBridge()->ReceiveInputEvent(input);
+    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
+      return INPUT_RESULT_IGNORED;
+    }
+
+    PostInputEvent([input = std::move(input), result](nsWindow* window) {
+      WidgetWheelEvent wheelEvent = input.ToWidgetEvent(window);
+      window->ProcessUntransformedAPZEvent(&wheelEvent, result);
+    });
+
+    switch (result.GetStatus()) {
+      case nsEventStatus_eIgnore:
+        return INPUT_RESULT_UNHANDLED;
+      case nsEventStatus_eConsumeDoDefault:
+        return result.GetHandledResult()->IsHandledByRoot()
+                   ? INPUT_RESULT_HANDLED
+                   : INPUT_RESULT_HANDLED_CONTENT;
+      default:
+        MOZ_ASSERT_UNREACHABLE("Unexpected nsEventStatus");
+        return INPUT_RESULT_UNHANDLED;
+    }
+  }
+
+ private:
+  static MouseInput::ButtonType GetButtonType(int button) {
+    MouseInput::ButtonType result = MouseInput::NONE;
+
+    switch (button) {
+      case java::sdk::MotionEvent::BUTTON_PRIMARY:
+        result = MouseInput::PRIMARY_BUTTON;
+        break;
+      case java::sdk::MotionEvent::BUTTON_SECONDARY:
+        result = MouseInput::SECONDARY_BUTTON;
+        break;
+      case java::sdk::MotionEvent::BUTTON_TERTIARY:
+        result = MouseInput::MIDDLE_BUTTON;
+        break;
+      default:
+        break;
+    }
+
+    return result;
+  }
+
+  static int16_t ConvertButtons(int buttons) {
+    int16_t result = 0;
+
+    if (buttons & java::sdk::MotionEvent::BUTTON_PRIMARY) {
+      result |= MouseButtonsFlag::ePrimaryFlag;
+    }
+    if (buttons & java::sdk::MotionEvent::BUTTON_SECONDARY) {
+      result |= MouseButtonsFlag::eSecondaryFlag;
+    }
+    if (buttons & java::sdk::MotionEvent::BUTTON_TERTIARY) {
+      result |= MouseButtonsFlag::eMiddleFlag;
+    }
+    if (buttons & java::sdk::MotionEvent::BUTTON_BACK) {
+      result |= MouseButtonsFlag::e4thFlag;
+    }
+    if (buttons & java::sdk::MotionEvent::BUTTON_FORWARD) {
+      result |= MouseButtonsFlag::e5thFlag;
+    }
+
+    return result;
+  }
+
+  static int32_t ConvertAPZHandledPlace(APZHandledPlace aHandledPlace) {
+    switch (aHandledPlace) {
+      case APZHandledPlace::Unhandled:
+        return INPUT_RESULT_UNHANDLED;
+      case APZHandledPlace::HandledByRoot:
+        return INPUT_RESULT_HANDLED;
+      case APZHandledPlace::HandledByContent:
+        return INPUT_RESULT_HANDLED_CONTENT;
+      case APZHandledPlace::Invalid:
+        MOZ_ASSERT_UNREACHABLE("The handled result should NOT be Invalid");
+        return INPUT_RESULT_UNHANDLED;
+    }
+    MOZ_ASSERT_UNREACHABLE("Unknown handled result");
+    return INPUT_RESULT_UNHANDLED;
+  }
+
+  static int32_t ConvertSideBits(SideBits aSideBits) {
+    int32_t ret = java::PanZoomController::SCROLLABLE_FLAG_NONE;
+    if (aSideBits & SideBits::eTop) {
+      ret |= java::PanZoomController::SCROLLABLE_FLAG_TOP;
+    }
+    if (aSideBits & SideBits::eRight) {
+      ret |= java::PanZoomController::SCROLLABLE_FLAG_RIGHT;
+    }
+    if (aSideBits & SideBits::eBottom) {
+      ret |= java::PanZoomController::SCROLLABLE_FLAG_BOTTOM;
+    }
+    if (aSideBits & SideBits::eLeft) {
+      ret |= java::PanZoomController::SCROLLABLE_FLAG_LEFT;
+    }
+    return ret;
+  }
+
+  static int32_t ConvertScrollDirections(
+      layers::ScrollDirections aScrollDirections) {
+    int32_t ret = java::PanZoomController::OVERSCROLL_FLAG_NONE;
+    if (aScrollDirections.contains(layers::HorizontalScrollDirection)) {
+      ret |= java::PanZoomController::OVERSCROLL_FLAG_HORIZONTAL;
+    }
+    if (aScrollDirections.contains(layers::VerticalScrollDirection)) {
+      ret |= java::PanZoomController::OVERSCROLL_FLAG_VERTICAL;
+    }
+    return ret;
+  }
+
+  static java::PanZoomController::InputResultDetail::LocalRef
+  ConvertAPZHandledResult(const APZHandledResult& aHandledResult) {
+    return java::PanZoomController::InputResultDetail::New(
+        ConvertAPZHandledPlace(aHandledResult.mPlace),
+        ConvertSideBits(aHandledResult.mScrollableDirections),
+        ConvertScrollDirections(aHandledResult.mOverscrollDirections));
+  }
+
+ public:
+  int32_t HandleMouseEvent(int32_t aAction, int64_t aTime, int32_t aMetaState,
+                           float aX, float aY, int buttons) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    RefPtr<IAPZCTreeManager> controller;
+
+    if (auto window = mWindow.Access()) {
+      nsWindow* gkWindow = window->GetNsWindow();
+      if (gkWindow) {
+        controller = gkWindow->mAPZC;
+      }
+    }
+
+    if (!controller) {
+      return INPUT_RESULT_UNHANDLED;
+    }
+
+    MouseInput::MouseType mouseType = MouseInput::MOUSE_NONE;
+    MouseInput::ButtonType buttonType = MouseInput::NONE;
+    switch (aAction) {
+      case java::sdk::MotionEvent::ACTION_DOWN:
+        mouseType = MouseInput::MOUSE_DOWN;
+        buttonType = GetButtonType(buttons ^ mPreviousButtons);
+        mPreviousButtons = buttons;
+        break;
+      case java::sdk::MotionEvent::ACTION_UP:
+        mouseType = MouseInput::MOUSE_UP;
+        buttonType = GetButtonType(buttons ^ mPreviousButtons);
+        mPreviousButtons = buttons;
+        break;
+      case java::sdk::MotionEvent::ACTION_MOVE:
+        mouseType = MouseInput::MOUSE_MOVE;
+        break;
+      case java::sdk::MotionEvent::ACTION_HOVER_MOVE:
+        mouseType = MouseInput::MOUSE_MOVE;
+        break;
+      case java::sdk::MotionEvent::ACTION_HOVER_ENTER:
+        mouseType = MouseInput::MOUSE_WIDGET_ENTER;
+        break;
+      case java::sdk::MotionEvent::ACTION_HOVER_EXIT:
+        mouseType = MouseInput::MOUSE_WIDGET_EXIT;
+        break;
+      default:
+        break;
+    }
+
+    if (mouseType == MouseInput::MOUSE_NONE) {
+      return INPUT_RESULT_UNHANDLED;
+    }
+
+    ScreenPoint origin = ScreenPoint(aX, aY);
+
+    MouseInput input(
+        mouseType, buttonType, MouseEvent_Binding::MOZ_SOURCE_MOUSE,
+        ConvertButtons(buttons), origin, nsWindow::GetEventTimeStamp(aTime),
+        nsWindow::GetModifiers(aMetaState));
+
+    APZEventResult result = controller->InputBridge()->ReceiveInputEvent(input);
+    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
+      return INPUT_RESULT_IGNORED;
+    }
+
+    PostInputEvent([input = std::move(input), result](nsWindow* window) {
+      WidgetMouseEvent mouseEvent = input.ToWidgetEvent(window);
+      window->ProcessUntransformedAPZEvent(&mouseEvent, result);
+    });
+
+    switch (result.GetStatus()) {
+      case nsEventStatus_eIgnore:
+        return INPUT_RESULT_UNHANDLED;
+      case nsEventStatus_eConsumeDoDefault:
+        return result.GetHandledResult()->IsHandledByRoot()
+                   ? INPUT_RESULT_HANDLED
+                   : INPUT_RESULT_HANDLED_CONTENT;
+      default:
+        MOZ_ASSERT_UNREACHABLE("Unexpected nsEventStatus");
+        return INPUT_RESULT_UNHANDLED;
+    }
+  }
+
+  // Convert MotionEvent touch radius and orientation into the format required
+  // by w3c touchevents.
+  // toolMajor and toolMinor span a rectangle that's oriented as per
+  // aOrientation, centered around the touch point.
+  static std::pair<float, ScreenSize> ConvertOrientationAndRadius(
+      float aOrientation, float aToolMajor, float aToolMinor) {
+    float angle = aOrientation * 180.0f / M_PI;
+    // w3c touchevents spec does not allow orientations == 90
+    // this shifts it to -90, which will be shifted to zero below
+    if (angle >= 90.0) {
+      angle -= 180.0f;
+    }
+
+    // w3c touchevent radii are given with an orientation between 0 and
+    // 90. The radii are found by removing the orientation and
+    // measuring the x and y radii of the resulting ellipse. For
+    // Android orientations >= 0 and < 90, use the y radius as the
+    // major radius, and x as the minor radius. However, for an
+    // orientation < 0, we have to shift the orientation by adding 90,
+    // and reverse which radius is major and minor.
+    ScreenSize radius;
+    if (angle < 0.0f) {
+      angle += 90.0f;
+      radius =
+          ScreenSize(int32_t(aToolMajor / 2.0f), int32_t(aToolMinor / 2.0f));
+    } else {
+      radius =
+          ScreenSize(int32_t(aToolMinor / 2.0f), int32_t(aToolMajor / 2.0f));
+    }
+
+    return std::make_pair(angle, radius);
+  }
+
+  void HandleMotionEvent(
+      const java::PanZoomController::NativeProvider::LocalRef& aInstance,
+      jni::Object::Param aEventData, float aScreenX, float aScreenY,
+      jni::Object::Param aResult) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    auto returnResult = java::GeckoResult::Ref::From(aResult);
+    auto eventData =
+        java::PanZoomController::MotionEventData::Ref::From(aEventData);
+    nsTArray<int32_t> pointerId(eventData->PointerId()->GetElements());
+    size_t pointerCount = pointerId.Length();
+    MultiTouchInput::MultiTouchType type;
+    size_t startIndex = 0;
+    size_t endIndex = pointerCount;
+
+    switch (eventData->Action()) {
+      case java::sdk::MotionEvent::ACTION_DOWN:
+      case java::sdk::MotionEvent::ACTION_POINTER_DOWN:
+        type = MultiTouchInput::MULTITOUCH_START;
+        break;
+      case java::sdk::MotionEvent::ACTION_MOVE:
+        type = MultiTouchInput::MULTITOUCH_MOVE;
+        break;
+      case java::sdk::MotionEvent::ACTION_UP:
+      case java::sdk::MotionEvent::ACTION_POINTER_UP:
+        // for pointer-up events we only want the data from
+        // the one pointer that went up
+        type = MultiTouchInput::MULTITOUCH_END;
+        startIndex = eventData->ActionIndex();
+        endIndex = startIndex + 1;
+        break;
+      case java::sdk::MotionEvent::ACTION_OUTSIDE:
+      case java::sdk::MotionEvent::ACTION_CANCEL:
+        type = MultiTouchInput::MULTITOUCH_CANCEL;
+        break;
+      default:
+        if (returnResult) {
+          returnResult->Complete(
+              java::sdk::Integer::ValueOf(INPUT_RESULT_UNHANDLED));
+        }
+        return;
+    }
+
+    MultiTouchInput input(type, eventData->Time(),
+                          nsWindow::GetEventTimeStamp(eventData->Time()), 0);
+    input.modifiers = nsWindow::GetModifiers(eventData->MetaState());
+    input.mTouches.SetCapacity(endIndex - startIndex);
+    input.mScreenOffset =
+        ExternalIntPoint(int32_t(floorf(aScreenX)), int32_t(floorf(aScreenY)));
+
+    size_t historySize = eventData->HistorySize();
+    nsTArray<int64_t> historicalTime(
+        eventData->HistoricalTime()->GetElements());
+    MOZ_RELEASE_ASSERT(historicalTime.Length() == historySize);
+
+    // Each of these is |historySize| sets of |pointerCount| values.
+    size_t historicalDataCount = historySize * pointerCount;
+    nsTArray<float> historicalX(eventData->HistoricalX()->GetElements());
+    nsTArray<float> historicalY(eventData->HistoricalY()->GetElements());
+    nsTArray<float> historicalOrientation(
+        eventData->HistoricalOrientation()->GetElements());
+    nsTArray<float> historicalPressure(
+        eventData->HistoricalPressure()->GetElements());
+    nsTArray<float> historicalToolMajor(
+        eventData->HistoricalToolMajor()->GetElements());
+    nsTArray<float> historicalToolMinor(
+        eventData->HistoricalToolMinor()->GetElements());
+
+    MOZ_RELEASE_ASSERT(historicalX.Length() == historicalDataCount);
+    MOZ_RELEASE_ASSERT(historicalY.Length() == historicalDataCount);
+    MOZ_RELEASE_ASSERT(historicalOrientation.Length() == historicalDataCount);
+    MOZ_RELEASE_ASSERT(historicalPressure.Length() == historicalDataCount);
+    MOZ_RELEASE_ASSERT(historicalToolMajor.Length() == historicalDataCount);
+    MOZ_RELEASE_ASSERT(historicalToolMinor.Length() == historicalDataCount);
+
+    // Each of these is |pointerCount| values.
+    nsTArray<float> x(eventData->X()->GetElements());
+    nsTArray<float> y(eventData->Y()->GetElements());
+    nsTArray<float> orientation(eventData->Orientation()->GetElements());
+    nsTArray<float> pressure(eventData->Pressure()->GetElements());
+    nsTArray<float> toolMajor(eventData->ToolMajor()->GetElements());
+    nsTArray<float> toolMinor(eventData->ToolMinor()->GetElements());
+
+    MOZ_ASSERT(x.Length() == pointerCount);
+    MOZ_ASSERT(y.Length() == pointerCount);
+    MOZ_ASSERT(orientation.Length() == pointerCount);
+    MOZ_ASSERT(pressure.Length() == pointerCount);
+    MOZ_ASSERT(toolMajor.Length() == pointerCount);
+    MOZ_ASSERT(toolMinor.Length() == pointerCount);
+
+    for (size_t i = startIndex; i < endIndex; i++) {
+      auto [orien, radius] = ConvertOrientationAndRadius(
+          orientation[i], toolMajor[i], toolMinor[i]);
+
+      ScreenIntPoint point(int32_t(floorf(x[i])), int32_t(floorf(y[i])));
+      SingleTouchData singleTouchData(pointerId[i], point, radius, orien,
+                                      pressure[i]);
+
+      for (size_t historyIndex = 0; historyIndex < historySize;
+           historyIndex++) {
+        size_t historicalI = historyIndex * pointerCount + i;
+        auto [historicalAngle, historicalRadius] = ConvertOrientationAndRadius(
+            historicalOrientation[historicalI],
+            historicalToolMajor[historicalI], historicalToolMinor[historicalI]);
+        ScreenIntPoint historicalPoint(
+            int32_t(floorf(historicalX[historicalI])),
+            int32_t(floorf(historicalY[historicalI])));
+        singleTouchData.mHistoricalData.AppendElement(
+            SingleTouchData::HistoricalTouchData{
+                nsWindow::GetEventTimeStamp(historicalTime[historyIndex]),
+                historicalPoint,
+                {},  // mLocalScreenPoint will be computed later by APZ
+                historicalRadius,
+                historicalAngle,
+                historicalPressure[historicalI]});
+      }
+
+      input.mTouches.AppendElement(singleTouchData);
+    }
+
+    if (mAndroidVsync &&
+        eventData->Action() == java::sdk::MotionEvent::ACTION_DOWN) {
+      // Query pref value at the beginning of a touch gesture so that we don't
+      // leave events stuck in the resampler after a pref flip.
+      mTouchResamplingEnabled = StaticPrefs::android_touch_resampling_enabled();
+    }
+
+    if (!mTouchResamplingEnabled) {
+      FinishHandlingMotionEvent(std::move(input),
+                                java::GeckoResult::LocalRef(returnResult));
+      return;
+    }
+
+    uint64_t eventId = mTouchResampler.ProcessEvent(std::move(input));
+    mPendingMotionEventReturnResults.push(
+        {eventId, java::GeckoResult::GlobalRef(returnResult)});
+
+    RegisterOrUnregisterForVsync(mTouchResampler.InTouchingState());
+    ConsumeMotionEventsFromResampler();
+  }
+
+  void RegisterOrUnregisterForVsync(bool aNeedVsync) {
+    MOZ_RELEASE_ASSERT(mAndroidVsync);
+    if (aNeedVsync && !mListeningToVsync) {
+      MOZ_ASSERT(!mObserver);
+      auto win = mWindow.Access();
+      if (!win) {
+        return;
+      }
+      RefPtr<nsWindow> gkWindow = win->GetNsWindow();
+      if (!gkWindow) {
+        return;
+      }
+      MutexAutoLock lock(gkWindow->GetDestroyMutex());
+      if (gkWindow->Destroyed()) {
+        return;
+      }
+      jni::NativeWeakPtr<NPZCSupport> weakPtrToThis =
+          gkWindow->GetNPZCSupportWeakPtr();
+      mObserver = Observer::Create(std::move(weakPtrToThis));
+      mAndroidVsync->RegisterObserver(mObserver, AndroidVsync::INPUT);
+    } else if (!aNeedVsync && mListeningToVsync) {
+      mAndroidVsync->UnregisterObserver(mObserver, AndroidVsync::INPUT);
+      mObserver = nullptr;
+    }
+    mListeningToVsync = aNeedVsync;
+  }
+
+  void ConsumeMotionEventsFromResampler() {
+    auto outgoing = mTouchResampler.ConsumeOutgoingEvents();
+    while (!outgoing.empty()) {
+      auto outgoingEvent = std::move(outgoing.front());
+      outgoing.pop();
+      java::GeckoResult::GlobalRef returnResult;
+      if (outgoingEvent.mEventId) {
+        // Look up the GeckoResult for this event.
+        // The outgoing events from the resampler are in the same order as the
+        // original events, and no event IDs are skipped.
+        MOZ_RELEASE_ASSERT(!mPendingMotionEventReturnResults.empty());
+        auto pair = mPendingMotionEventReturnResults.front();
+        mPendingMotionEventReturnResults.pop();
+        MOZ_RELEASE_ASSERT(pair.first == *outgoingEvent.mEventId);
+        returnResult = pair.second;
+      }
+      FinishHandlingMotionEvent(std::move(outgoingEvent.mEvent),
+                                java::GeckoResult::LocalRef(returnResult));
+    }
+  }
+
+  void FinishHandlingMotionEvent(MultiTouchInput&& aInput,
+                                 java::GeckoResult::LocalRef&& aReturnResult) {
+    RefPtr<IAPZCTreeManager> controller;
+
+    if (auto window = mWindow.Access()) {
+      nsWindow* gkWindow = window->GetNsWindow();
+      if (gkWindow) {
+        controller = gkWindow->mAPZC;
+      }
+    }
+
+    if (!controller) {
+      if (aReturnResult) {
+        aReturnResult->Complete(java::PanZoomController::InputResultDetail::New(
+            INPUT_RESULT_UNHANDLED,
+            java::PanZoomController::SCROLLABLE_FLAG_NONE,
+            java::PanZoomController::OVERSCROLL_FLAG_NONE));
+      }
+      return;
+    }
+
+    APZInputBridge::InputBlockCallback callback;
+    if (aReturnResult) {
+      callback = [aReturnResult = java::GeckoResult::GlobalRef(aReturnResult)](
+                     uint64_t aInputBlockId,
+                     const APZHandledResult& aHandledResult) {
+        aReturnResult->Complete(ConvertAPZHandledResult(aHandledResult));
+      };
+    }
+    APZEventResult result = controller->InputBridge()->ReceiveInputEvent(
+        aInput, std::move(callback));
+
+    if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
+      if (aReturnResult) {
+        if (result.GetHandledResult() != Nothing()) {
+          aReturnResult->Complete(
+              ConvertAPZHandledResult(result.GetHandledResult().value()));
+        } else {
+          MOZ_ASSERT_UNREACHABLE(
+              "nsEventStatus_eConsumeNoDefault should involve a valid "
+              "APZHandledResult");
+          aReturnResult->Complete(
+              java::PanZoomController::InputResultDetail::New(
+                  INPUT_RESULT_IGNORED,
+                  java::PanZoomController::SCROLLABLE_FLAG_NONE,
+                  java::PanZoomController::OVERSCROLL_FLAG_NONE));
+        }
+      }
+      return;
+    }
+
+    // Dispatch APZ input event on Gecko thread.
+    PostInputEvent([input = std::move(aInput), result](nsWindow* window) {
+      WidgetTouchEvent touchEvent = input.ToWidgetEvent(window);
+      window->ProcessUntransformedAPZEvent(&touchEvent, result);
+      window->DispatchHitTest(touchEvent);
+    });
+
+    if (aReturnResult && result.GetHandledResult() != Nothing()) {
+      MOZ_ASSERT(result.GetStatus() == nsEventStatus_eConsumeDoDefault ||
+                 result.GetStatus() == nsEventStatus_eIgnore);
+      aReturnResult->Complete(
+          ConvertAPZHandledResult(result.GetHandledResult().value()));
+    }
+  }
+};
+
+NS_IMPL_ISUPPORTS(AndroidView, nsIAndroidEventDispatcher, nsIAndroidView)
+
+nsresult AndroidView::GetInitData(JSContext* aCx,
+                                  JS::MutableHandle<JS::Value> aOut) {
+  if (!mInitData) {
+    aOut.setNull();
+    return NS_OK;
+  }
+
+  return widget::EventDispatcher::UnboxBundle(aCx, mInitData, aOut);
+}
+
+/**
+ * Compositor has some unique requirements for its native calls, so make it
+ * separate from GeckoViewSupport.
+ */
+class LayerViewSupport final
+    : public GeckoSession::Compositor::Natives<LayerViewSupport> {
+  WindowPtr mWindow;
+  GeckoSession::Compositor::WeakRef mCompositor;
+  Atomic<bool, ReleaseAcquire> mCompositorPaused;
+  java::sdk::Surface::GlobalRef mSurface;
+  java::sdk::SurfaceControl::GlobalRef mSurfaceControl;
+  int32_t mX;
+  int32_t mY;
+  int32_t mWidth;
+  int32_t mHeight;
+  // Used to communicate with the gecko compositor from the UI thread.
+  // Set in NotifyCompositorCreated and cleared in
+  // NotifyCompositorSessionLost.
+  RefPtr<UiCompositorControllerChild> mUiCompositorControllerChild;
+  // Whether we have requested a new Surface from the GeckoSession.
+  bool mRequestedNewSurface = false;
+
+  Maybe<uint32_t> mDefaultClearColor;
+
+  struct CaptureRequest {
+    explicit CaptureRequest() : mResult(nullptr) {}
+    explicit CaptureRequest(java::GeckoResult::GlobalRef aResult,
+                            java::sdk::Bitmap::GlobalRef aBitmap,
+                            const ScreenRect& aSource,
+                            const IntSize& aOutputSize)
+        : mResult(aResult),
+          mBitmap(aBitmap),
+          mSource(aSource),
+          mOutputSize(aOutputSize) {}
+
+    // where to send the pixels
+    java::GeckoResult::GlobalRef mResult;
+
+    // where to store the pixels
+    java::sdk::Bitmap::GlobalRef mBitmap;
+
+    ScreenRect mSource;
+
+    IntSize mOutputSize;
+  };
+  std::queue<CaptureRequest> mCapturePixelsResults;
+
+  // In order to use Event::HasSameTypeAs in PostTo(), we cannot make
+  // LayerViewEvent a template because each template instantiation is
+  // a different type. So implement LayerViewEvent as a ProxyEvent.
+  class LayerViewEvent final : public nsAppShell::ProxyEvent {
+    using Event = nsAppShell::Event;
+
+   public:
+    static UniquePtr<Event> MakeEvent(UniquePtr<Event>&& event) {
+      return MakeUnique<LayerViewEvent>(std::move(event));
+    }
+
+    explicit LayerViewEvent(UniquePtr<Event>&& event)
+        : nsAppShell::ProxyEvent(std::move(event)) {}
+
+    void PostTo(LinkedList<Event>& queue) override {
+      // Give priority to compositor events, but keep in order with
+      // existing compositor events.
+      nsAppShell::Event* event = queue.getFirst();
+      while (event && event->HasSameTypeAs(this)) {
+        event = event->getNext();
+      }
+      if (event) {
+        event->setPrevious(this);
+      } else {
+        queue.insertBack(this);
+      }
+    }
+  };
+
+ public:
+  typedef GeckoSession::Compositor::Natives<LayerViewSupport> Base;
+
+  LayerViewSupport(WindowPtr aWindow,
+                   const GeckoSession::Compositor::LocalRef& aInstance)
+      : mWindow(aWindow), mCompositor(aInstance), mCompositorPaused(true) {
+#if defined(DEBUG)
+    auto win(mWindow.Access());
+    MOZ_ASSERT(!!win);
+#endif  // defined(DEBUG)
+  }
+
+  ~LayerViewSupport() {}
+
+  using Base::AttachNative;
+  using Base::DisposeNative;
+
+  void OnWeakNonIntrusiveDetach(already_AddRefed<Runnable> aDisposer) {
+    RefPtr<Runnable> disposer = aDisposer;
+    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
+      GeckoSession::Compositor::GlobalRef compositor(mCompositor);
+      if (!compositor) {
+        return;
+      }
+
+      uiThread->Dispatch(NS_NewRunnableFunction(
+          "LayerViewSupport::OnWeakNonIntrusiveDetach",
+          [compositor, disposer = std::move(disposer),
+           results = &mCapturePixelsResults, window = mWindow]() mutable {
+            if (auto accWindow = window.Access()) {
+              while (!results->empty()) {
+                auto aResult =
+                    java::GeckoResult::LocalRef(results->front().mResult);
+                if (aResult) {
+                  aResult->CompleteExceptionally(
+                      java::sdk::IllegalStateException::New(
+                          "The compositor has detached from the session")
+                          .Cast<jni::Throwable>());
+                }
+                results->pop();
+              }
+            }
+
+            compositor->OnCompositorDetached();
+            disposer->Run();
+          }));
+    }
+  }
+
+  const GeckoSession::Compositor::Ref& GetJavaCompositor() const {
+    return mCompositor;
+  }
+
+  bool CompositorPaused() const { return mCompositorPaused; }
+
+  /// Called from the main thread whenever the compositor has been
+  /// (re)initialized.
+  void NotifyCompositorCreated(
+      RefPtr<UiCompositorControllerChild> aUiCompositorControllerChild) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+    mUiCompositorControllerChild = aUiCompositorControllerChild;
+
+    if (mDefaultClearColor) {
+      mUiCompositorControllerChild->SetDefaultClearColor(*mDefaultClearColor);
+    }
+
+    if (!mCompositorPaused) {
+      // If we are using SurfaceControl but mSurface is null, that means the
+      // previous surface was destroyed along with the the previous
+      // compositor, and we need to create a new one.
+      if (mSurfaceControl && !mSurface) {
+        mSurface = java::SurfaceControlManager::GetInstance()->GetChildSurface(
+            mSurfaceControl, mWidth, mHeight);
+      }
+
+      if (auto window{mWindow.Access()}) {
+        nsWindow* gkWindow = window->GetNsWindow();
+        if (gkWindow) {
+          mUiCompositorControllerChild->OnCompositorSurfaceChanged(
+              gkWindow->mWidgetId, mSurface);
+        }
+      }
+
+      bool resumed = mUiCompositorControllerChild->ResumeAndResize(
+          mX, mY, mWidth, mHeight);
+      if (!resumed) {
+        gfxCriticalNote
+            << "Failed to resume compositor from NotifyCompositorCreated";
+        RequestNewSurface();
+      }
+    }
+  }
+
+  /// Called from the main thread whenever the compositor has been destroyed.
+  void NotifyCompositorSessionLost() {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+    mUiCompositorControllerChild = nullptr;
+
+    if (mSurfaceControl) {
+      // If we are using SurfaceControl then we must set the Surface to null
+      // here to ensure we create a new one when the new compositor is
+      // created.
+      mSurface = nullptr;
+    }
+
+    if (auto window = mWindow.Access()) {
+      while (!mCapturePixelsResults.empty()) {
+        auto result =
+            java::GeckoResult::LocalRef(mCapturePixelsResults.front().mResult);
+        if (result) {
+          result->CompleteExceptionally(
+              java::sdk::IllegalStateException::New(
+                  "Compositor session lost during screen pixels request")
+                  .Cast<jni::Throwable>());
+        }
+        mCapturePixelsResults.pop();
+      }
+    }
+  }
+
+  java::sdk::Surface::Param GetSurface() { return mSurface; }
+
+ private:
+  already_AddRefed<DataSourceSurface> FlipScreenPixels(
+      Shmem& aMem, const ScreenIntSize& aInSize, const ScreenRect& aInRegion,
+      const IntSize& aOutSize) {
+    RefPtr<gfx::DataSourceSurface> image =
+        gfx::Factory::CreateWrappingDataSourceSurface(
+            aMem.get<uint8_t>(),
+            StrideForFormatAndWidth(SurfaceFormat::B8G8R8A8, aInSize.width),
+            IntSize(aInSize.width, aInSize.height), SurfaceFormat::B8G8R8A8);
+    RefPtr<gfx::DrawTarget> drawTarget =
+        gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
+            aOutSize, SurfaceFormat::B8G8R8A8);
+    if (!drawTarget) {
+      return nullptr;
+    }
+
+    drawTarget->SetTransform(Matrix::Scaling(1.0, -1.0) *
+                             Matrix::Translation(0, aOutSize.height));
+
+    gfx::Rect srcRect(aInRegion.x,
+                      (aInSize.height - aInRegion.height) - aInRegion.y,
+                      aInRegion.width, aInRegion.height);
+    gfx::Rect destRect(0, 0, aOutSize.width, aOutSize.height);
+    drawTarget->DrawSurface(image, destRect, srcRect);
+
+    RefPtr<gfx::SourceSurface> snapshot = drawTarget->Snapshot();
+    RefPtr<gfx::DataSourceSurface> data = snapshot->GetDataSurface();
+    return data.forget();
+  }
+
+  /**
+   * Compositor methods
+   */
+ public:
+  void AttachNPZC(jni::Object::Param aNPZC) {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(aNPZC);
+
+    auto locked(mWindow.Access());
+    if (!locked) {
+      return;  // Already shut down.
+    }
+
+    nsWindow* gkWindow = locked->GetNsWindow();
+
+    // We can have this situation if we get two GeckoViewSupport::Transfer()
+    // called before the first AttachNPZC() gets here. Just detach the current
+    // instance since that's what happens in GeckoViewSupport::Transfer() as
+    // well.
+    gkWindow->mNPZCSupport.Detach();
+
+    auto npzc = java::PanZoomController::NativeProvider::LocalRef(
+        jni::GetGeckoThreadEnv(),
+        java::PanZoomController::NativeProvider::Ref::From(aNPZC));
+    gkWindow->mNPZCSupport =
+        jni::NativeWeakPtrHolder<NPZCSupport>::Attach(npzc, mWindow, npzc);
+
+    DispatchToUiThread(
+        "LayerViewSupport::AttachNPZC",
+        [npzc = java::PanZoomController::NativeProvider::GlobalRef(npzc)] {
+          npzc->SetAttached(true);
+        });
+  }
+
+  void OnBoundsChanged(int32_t aLeft, int32_t aTop, int32_t aWidth,
+                       int32_t aHeight) {
+    MOZ_ASSERT(NS_IsMainThread());
+    auto acc = mWindow.Access();
+    if (!acc) {
+      return;  // Already shut down.
+    }
+
+    nsWindow* gkWindow = acc->GetNsWindow();
+    if (!gkWindow) {
+      return;
+    }
+
+    gkWindow->Resize(aLeft, aTop, aWidth, aHeight, /* repaint */ false);
+  }
+
+  void NotifyMemoryPressure() {
+    MOZ_ASSERT(NS_IsMainThread());
+    auto acc = mWindow.Access();
+    if (!acc) {
+      return;  // Already shut down.
+    }
+
+    nsWindow* gkWindow = acc->GetNsWindow();
+    if (!gkWindow || !gkWindow->mCompositorBridgeChild) {
+      return;
+    }
+
+    gkWindow->mCompositorBridgeChild->SendNotifyMemoryPressure();
+  }
+
+  void SetDynamicToolbarMaxHeight(int32_t aHeight) {
+    MOZ_ASSERT(NS_IsMainThread());
+    auto acc = mWindow.Access();
+    if (!acc) {
+      return;  // Already shut down.
+    }
+
+    nsWindow* gkWindow = acc->GetNsWindow();
+    if (!gkWindow) {
+      return;
+    }
+
+    gkWindow->UpdateDynamicToolbarMaxHeight(ScreenIntCoord(aHeight));
+  }
+
+  void SyncPauseCompositor() {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    mCompositorPaused = true;
+
+    if (mUiCompositorControllerChild) {
+      mUiCompositorControllerChild->Pause();
+
+      mSurface = nullptr;
+      mSurfaceControl = nullptr;
+      if (auto window = mWindow.Access()) {
+        nsWindow* gkWindow = window->GetNsWindow();
+        if (gkWindow) {
+          mUiCompositorControllerChild->OnCompositorSurfaceChanged(
+              gkWindow->mWidgetId, nullptr);
+        }
+      }
+    }
+
+    if (auto lock{mWindow.Access()}) {
+      while (!mCapturePixelsResults.empty()) {
+        auto result =
+            java::GeckoResult::LocalRef(mCapturePixelsResults.front().mResult);
+        if (result) {
+          result->CompleteExceptionally(
+              java::sdk::IllegalStateException::New(
+                  "The compositor has detached from the session")
+                  .Cast<jni::Throwable>());
+        }
+        mCapturePixelsResults.pop();
+      }
+    }
+  }
+
+  void SyncResumeCompositor() {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    if (mUiCompositorControllerChild) {
+      mCompositorPaused = false;
+      bool resumed = mUiCompositorControllerChild->Resume();
+      if (!resumed) {
+        gfxCriticalNote
+            << "Failed to resume compositor from SyncResumeCompositor";
+        RequestNewSurface();
+      }
+    }
+  }
+
+  void SyncResumeResizeCompositor(
+      const GeckoSession::Compositor::LocalRef& aObj, int32_t aX, int32_t aY,
+      int32_t aWidth, int32_t aHeight, jni::Object::Param aSurface,
+      jni::Object::Param aSurfaceControl) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    mX = aX;
+    mY = aY;
+    mWidth = aWidth;
+    mHeight = aHeight;
+    mSurfaceControl =
+        java::sdk::SurfaceControl::GlobalRef::From(aSurfaceControl);
+    if (mSurfaceControl) {
+      // When using SurfaceControl, we create a child Surface to render in to
+      // rather than rendering directly in to the Surface provided by the
+      // application. This allows us to work around a bug on some versions of
+      // Android when recovering from a GPU process crash.
+      mSurface = java::SurfaceControlManager::GetInstance()->GetChildSurface(
+          mSurfaceControl, mWidth, mHeight);
+    } else {
+      mSurface = java::sdk::Surface::GlobalRef::From(aSurface);
+    }
+
+    if (mUiCompositorControllerChild) {
+      if (auto window = mWindow.Access()) {
+        nsWindow* gkWindow = window->GetNsWindow();
+        if (gkWindow) {
+          // Send new Surface to GPU process, if one exists.
+          mUiCompositorControllerChild->OnCompositorSurfaceChanged(
+              gkWindow->mWidgetId, mSurface);
+        }
+      }
+
+      bool resumed = mUiCompositorControllerChild->ResumeAndResize(
+          aX, aY, aWidth, aHeight);
+      if (!resumed) {
+        gfxCriticalNote
+            << "Failed to resume compositor from SyncResumeResizeCompositor";
+        // Only request a new Surface if this SyncResumeAndResize call is not
+        // response to a previous request, otherwise we will get stuck in an
+        // infinite loop.
+        if (!mRequestedNewSurface) {
+          RequestNewSurface();
+        }
+        return;
+      }
+    }
+
+    mRequestedNewSurface = false;
+
+    mCompositorPaused = false;
+
+    class OnResumedEvent : public nsAppShell::Event {
+      GeckoSession::Compositor::GlobalRef mCompositor;
+
+     public:
+      explicit OnResumedEvent(GeckoSession::Compositor::GlobalRef&& aCompositor)
+          : mCompositor(std::move(aCompositor)) {}
+
+      void Run() override {
+        MOZ_ASSERT(NS_IsMainThread());
+
+        JNIEnv* const env = jni::GetGeckoThreadEnv();
+        const auto lvsHolder =
+            GetNative(GeckoSession::Compositor::LocalRef(env, mCompositor));
+
+        if (!lvsHolder) {
+          env->ExceptionClear();
+          return;  // Already shut down.
+        }
+
+        auto lvs(lvsHolder->Access());
+        if (!lvs) {
+          env->ExceptionClear();
+          return;  // Already shut down.
+        }
+
+        auto win = lvs->mWindow.Access();
+        if (!win) {
+          env->ExceptionClear();
+          return;  // Already shut down.
+        }
+
+        // When we get here, the compositor has already been told to
+        // resume. This means it's now safe for layer updates to occur.
+        // Since we might have prevented one or more draw events from
+        // occurring while the compositor was paused, we need to
+        // schedule a draw event now.
+        if (!lvs->mCompositorPaused) {
+          nsWindow* const gkWindow = win->GetNsWindow();
+          if (gkWindow) {
+            gkWindow->RedrawAll();
+          }
+        }
+      }
+    };
+
+    // Use priority queue for timing-sensitive event.
+    nsAppShell::PostEvent(
+        MakeUnique<LayerViewEvent>(MakeUnique<OnResumedEvent>(aObj)));
+  }
+
+  void RequestNewSurface() {
+    if (const auto& compositor = GetJavaCompositor()) {
+      mRequestedNewSurface = true;
+      if (mSurfaceControl) {
+        java::SurfaceControlManager::GetInstance()->RemoveSurface(
+            mSurfaceControl);
+      }
+      compositor->RequestNewSurface();
+    }
+  }
+
+  mozilla::jni::Object::LocalRef GetMagnifiableSurface() {
+    return mozilla::jni::Object::LocalRef::From(GetSurface());
+  }
+
+  void SyncInvalidateAndScheduleComposite() {
+    if (!mUiCompositorControllerChild) {
+      return;
+    }
+
+    if (AndroidBridge::IsJavaUiThread()) {
+      mUiCompositorControllerChild->InvalidateAndRender();
+      return;
+    }
+
+    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
+      uiThread->Dispatch(NewRunnableMethod<>(
+                             "LayerViewSupport::InvalidateAndRender",
+                             mUiCompositorControllerChild,
+                             &UiCompositorControllerChild::InvalidateAndRender),
+                         nsIThread::DISPATCH_NORMAL);
+    }
+  }
+
+  void SetMaxToolbarHeight(int32_t aHeight) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+
+    if (mUiCompositorControllerChild) {
+      mUiCompositorControllerChild->SetMaxToolbarHeight(aHeight);
+    }
+  }
+
+  void SetFixedBottomOffset(int32_t aOffset) {
+    if (auto acc{mWindow.Access()}) {
+      nsWindow* gkWindow = acc->GetNsWindow();
+      if (gkWindow) {
+        gkWindow->UpdateDynamicToolbarOffset(ScreenIntCoord(aOffset));
+      }
+    }
+
+    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
+      uiThread->Dispatch(NS_NewRunnableFunction(
+          "LayerViewSupport::SetFixedBottomOffset", [this, offset = aOffset] {
+            if (mUiCompositorControllerChild) {
+              mUiCompositorControllerChild->SetFixedBottomOffset(offset);
+            }
+          }));
+    }
+  }
+
+  void SendToolbarAnimatorMessage(int32_t aMessage) {
+    if (!mUiCompositorControllerChild) {
+      return;
+    }
+
+    if (AndroidBridge::IsJavaUiThread()) {
+      mUiCompositorControllerChild->ToolbarAnimatorMessageFromUI(aMessage);
+      return;
+    }
+
+    if (RefPtr<nsThread> uiThread = GetAndroidUiThread()) {
+      uiThread->Dispatch(
+          NewRunnableMethod<int32_t>(
+              "LayerViewSupport::ToolbarAnimatorMessageFromUI",
+              mUiCompositorControllerChild,
+              &UiCompositorControllerChild::ToolbarAnimatorMessageFromUI,
+              aMessage),
+          nsIThread::DISPATCH_NORMAL);
+    }
+  }
+
+  void RecvToolbarAnimatorMessage(int32_t aMessage) {
+    auto compositor = GeckoSession::Compositor::LocalRef(mCompositor);
+    if (compositor) {
+      compositor->RecvToolbarAnimatorMessage(aMessage);
+    }
+  }
+
+  void SetDefaultClearColor(int32_t aColor) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+    mDefaultClearColor = Some((uint32_t)aColor);
+    if (mUiCompositorControllerChild) {
+      mUiCompositorControllerChild->SetDefaultClearColor((uint32_t)aColor);
+    }
+  }
+
+  void RequestScreenPixels(jni::Object::Param aResult,
+                           jni::Object::Param aTarget, int32_t aXOffset,
+                           int32_t aYOffset, int32_t aSrcWidth,
+                           int32_t aSrcHeight, int32_t aOutWidth,
+                           int32_t aOutHeight) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+    auto result = java::GeckoResult::LocalRef(aResult);
+
+    if (!mUiCompositorControllerChild) {
+      if (result) {
+        if (auto window = mWindow.Access()) {
+          result->CompleteExceptionally(
+              java::sdk::IllegalStateException::New(
+                  "Compositor session lost prior to screen pixels request")
+                  .Cast<jni::Throwable>());
+        }
+      }
+      return;
+    }
+
+    int size = 0;
+    if (auto window = mWindow.Access()) {
+      mCapturePixelsResults.push(CaptureRequest(
+          java::GeckoResult::GlobalRef(result),
+          java::sdk::Bitmap::GlobalRef(java::sdk::Bitmap::LocalRef(aTarget)),
+          ScreenRect(aXOffset, aYOffset, aSrcWidth, aSrcHeight),
+          IntSize(aOutWidth, aOutHeight)));
+      size = mCapturePixelsResults.size();
+    }
+
+    if (size == 1) {
+      mUiCompositorControllerChild->RequestScreenPixels();
+    }
+  }
+
+  void RecvScreenPixels(Shmem&& aMem, const ScreenIntSize& aSize,
+                        bool aNeedsYFlip) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+    CaptureRequest request;
+    java::GeckoResult::LocalRef result = nullptr;
+    java::sdk::Bitmap::LocalRef bitmap = nullptr;
+    if (auto window = mWindow.Access()) {
+      // The result might have been already rejected if the compositor was
+      // detached from the session
+      if (!mCapturePixelsResults.empty()) {
+        request = mCapturePixelsResults.front();
+        result = java::GeckoResult::LocalRef(request.mResult);
+        bitmap = java::sdk::Bitmap::LocalRef(request.mBitmap);
+        mCapturePixelsResults.pop();
+      }
+    }
+
+    if (result) {
+      if (bitmap) {
+        RefPtr<DataSourceSurface> surf;
+        if (aNeedsYFlip) {
+          surf = FlipScreenPixels(aMem, aSize, request.mSource,
+                                  request.mOutputSize);
+        } else {
+          surf = gfx::Factory::CreateWrappingDataSourceSurface(
+              aMem.get<uint8_t>(),
+              StrideForFormatAndWidth(SurfaceFormat::B8G8R8A8, aSize.width),
+              IntSize(aSize.width, aSize.height), SurfaceFormat::B8G8R8A8);
+        }
+        if (surf) {
+          DataSourceSurface::ScopedMap smap(surf, DataSourceSurface::READ);
+          auto pixels = mozilla::jni::ByteBuffer::New(
+              reinterpret_cast<int8_t*>(smap.GetData()),
+              smap.GetStride() * request.mOutputSize.height);
+          bitmap->CopyPixelsFromBuffer(pixels);
+          result->Complete(bitmap);
+        } else {
+          result->CompleteExceptionally(
+              java::sdk::IllegalStateException::New(
+                  "Failed to create flipped snapshot surface (probably out "
+                  "of memory)")
+                  .Cast<jni::Throwable>());
+        }
+      } else {
+        result->CompleteExceptionally(java::sdk::IllegalArgumentException::New(
+                                          "No target bitmap argument provided")
+                                          .Cast<jni::Throwable>());
+      }
+    }
+
+    // Pixels have been copied, so Dealloc Shmem
+    if (mUiCompositorControllerChild) {
+      mUiCompositorControllerChild->DeallocPixelBuffer(aMem);
+
+      if (auto window = mWindow.Access()) {
+        if (!mCapturePixelsResults.empty()) {
+          mUiCompositorControllerChild->RequestScreenPixels();
+        }
+      }
+    }
+  }
+
+  void EnableLayerUpdateNotifications(bool aEnable) {
+    MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+    if (mUiCompositorControllerChild) {
+      mUiCompositorControllerChild->EnableLayerUpdateNotifications(aEnable);
+    }
+  }
+
+  void OnSafeAreaInsetsChanged(int32_t aTop, int32_t aRight, int32_t aBottom,
+                               int32_t aLeft) {
+    MOZ_ASSERT(NS_IsMainThread());
+    auto win(mWindow.Access());
+    if (!win) {
+      return;  // Already shut down.
+    }
+
+    nsWindow* gkWindow = win->GetNsWindow();
+    if (!gkWindow) {
+      return;
+    }
+
+    ScreenIntMargin safeAreaInsets(aTop, aRight, aBottom, aLeft);
+    gkWindow->UpdateSafeAreaInsets(safeAreaInsets);
+  }
+};
+
+GeckoViewSupport::~GeckoViewSupport() {
+  if (mWindow) {
+    mWindow->DetachNatives();
+  }
+}
+
+/* static */
+void GeckoViewSupport::Open(
+    const jni::Class::LocalRef& aCls, GeckoSession::Window::Param aWindow,
+    jni::Object::Param aQueue, jni::Object::Param aCompositor,
+    jni::Object::Param aDispatcher, jni::Object::Param aSessionAccessibility,
+    jni::Object::Param aInitData, jni::String::Param aId,
+    jni::String::Param aChromeURI, bool aPrivateMode) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  AUTO_PROFILER_LABEL("mozilla::widget::GeckoViewSupport::Open", OTHER);
+
+  // We'll need gfxPlatform to be initialized to create a compositor later.
+  // Might as well do that now so that the GPU process launch can get a head
+  // start.
+  gfxPlatform::GetPlatform();
+
+  nsCOMPtr<nsIWindowWatcher> ww = do_GetService(NS_WINDOWWATCHER_CONTRACTID);
+  MOZ_RELEASE_ASSERT(ww);
+
+  nsAutoCString url;
+  if (aChromeURI) {
+    url = aChromeURI->ToCString();
+  } else {
+    nsresult rv = Preferences::GetCString("toolkit.defaultChromeURI", url);
+    if (NS_FAILED(rv)) {
+      url = "chrome://geckoview/content/geckoview.xhtml"_ns;
+    }
+  }
+
+  // Prepare an nsIAndroidView to pass as argument to the window.
+  RefPtr<AndroidView> androidView = new AndroidView();
+  androidView->mEventDispatcher->Attach(
+      java::EventDispatcher::Ref::From(aDispatcher), nullptr);
+  androidView->mInitData = java::GeckoBundle::Ref::From(aInitData);
+
+  nsAutoCString chromeFlags("chrome,dialog=0,remote,resizable,scrollbars");
+  if (aPrivateMode) {
+    chromeFlags += ",private";
+  }
+  nsCOMPtr<mozIDOMWindowProxy> domWindow;
+  ww->OpenWindow(nullptr, url, nsDependentCString(aId->ToCString().get()),
+                 chromeFlags, androidView, getter_AddRefs(domWindow));
+  MOZ_RELEASE_ASSERT(domWindow);
+
+  nsCOMPtr<nsPIDOMWindowOuter> pdomWindow = nsPIDOMWindowOuter::From(domWindow);
+  const RefPtr<nsWindow> window = nsWindow::From(pdomWindow);
+  MOZ_ASSERT(window);
+
+  // Attach a new GeckoView support object to the new window.
+  GeckoSession::Window::LocalRef sessionWindow(aCls.Env(), aWindow);
+  auto weakGeckoViewSupport =
+      jni::NativeWeakPtrHolder<GeckoViewSupport>::Attach(
+          sessionWindow, window, sessionWindow, pdomWindow);
+
+  window->mGeckoViewSupport = weakGeckoViewSupport;
+  window->mAndroidView = androidView;
+
+  // Attach other session support objects.
+  {  // Scope for gvsAccess
+    auto gvsAccess = weakGeckoViewSupport.Access();
+    MOZ_ASSERT(gvsAccess);
+
+    gvsAccess->Transfer(sessionWindow, aQueue, aCompositor, aDispatcher,
+                        aSessionAccessibility, aInitData);
+  }
+
+  if (window->mWidgetListener) {
+    nsCOMPtr<nsIAppWindow> appWindow(window->mWidgetListener->GetAppWindow());
+    if (appWindow) {
+      // Our window is not intrinsically sized, so tell AppWindow to
+      // not set a size for us.
+      appWindow->SetIntrinsicallySized(false);
+    }
+  }
+}
+
+void GeckoViewSupport::Close() {
+  if (mWindow) {
+    if (mWindow->mAndroidView) {
+      mWindow->mAndroidView->mEventDispatcher->Detach();
+    }
+    mWindow = nullptr;
+  }
+
+  if (!mDOMWindow) {
+    return;
+  }
+
+  mDOMWindow->ForceClose();
+  mDOMWindow = nullptr;
+  mGeckoViewWindow = nullptr;
+}
+
+void GeckoViewSupport::Transfer(const GeckoSession::Window::LocalRef& inst,
+                                jni::Object::Param aQueue,
+                                jni::Object::Param aCompositor,
+                                jni::Object::Param aDispatcher,
+                                jni::Object::Param aSessionAccessibility,
+                                jni::Object::Param aInitData) {
+  mWindow->mNPZCSupport.Detach();
+
+  auto compositor = GeckoSession::Compositor::LocalRef(
+      inst.Env(), GeckoSession::Compositor::Ref::From(aCompositor));
+
+  bool attachLvs;
+  {  // Scope for lvsAccess
+    auto lvsAccess{mWindow->mLayerViewSupport.Access()};
+    // If we do not yet have mLayerViewSupport, or if the compositor has
+    // changed, then we must attach a new one.
+    attachLvs = !lvsAccess || lvsAccess->GetJavaCompositor() != compositor;
+  }
+
+  if (attachLvs) {
+    mWindow->mLayerViewSupport =
+        jni::NativeWeakPtrHolder<LayerViewSupport>::Attach(
+            compositor, mWindow->mGeckoViewSupport, compositor);
+
+    if (RefPtr<UiCompositorControllerChild> uiCompositorController =
+            mWindow->GetUiCompositorControllerChild()) {
+      DispatchToUiThread(
+          "LayerViewSupport::NotifyCompositorCreated",
+          [lvs = mWindow->mLayerViewSupport, uiCompositorController] {
+            if (auto lvsAccess{lvs.Access()}) {
+              lvsAccess->NotifyCompositorCreated(uiCompositorController);
+            }
+          });
+    }
+  }
+
+  MOZ_ASSERT(mWindow->mAndroidView);
+  mWindow->mAndroidView->mEventDispatcher->Attach(
+      java::EventDispatcher::Ref::From(aDispatcher), mDOMWindow);
+
+  RefPtr<jni::DetachPromise> promise = mWindow->mSessionAccessibility.Detach();
+  if (aSessionAccessibility) {
+    // SessionAccessibility's JNI object isn't released immediately, it uses
+    // recycled object, we have to wait for released object completely.
+    auto sa = java::SessionAccessibility::NativeProvider::LocalRef(
+        aSessionAccessibility);
+    promise->Then(
+        GetMainThreadSerialEventTarget(),
+        "GeckoViewSupprt::Transfer::SessionAccessibility",
+        [inst = GeckoSession::Window::GlobalRef(inst),
+         sa = java::SessionAccessibility::NativeProvider::GlobalRef(sa),
+         window = mWindow, gvs = mWindow->mGeckoViewSupport](
+            const mozilla::jni::DetachPromise::ResolveOrRejectValue& aValue) {
+          MOZ_ASSERT(aValue.IsResolve());
+          if (window->Destroyed()) {
+            return;
+          }
+
+          MOZ_ASSERT(!window->mSessionAccessibility.IsAttached());
+          if (auto gvsAccess{gvs.Access()}) {
+            gvsAccess->AttachAccessibility(inst, sa);
+          }
+        });
+  }
+
+  if (mIsReady) {
+    // We're in a transfer; update init-data and notify JS code.
+    mWindow->mAndroidView->mInitData = java::GeckoBundle::Ref::From(aInitData);
+    OnReady(aQueue);
+    mWindow->mAndroidView->mEventDispatcher->Dispatch(
+        u"GeckoView:UpdateInitData");
+  }
+
+  DispatchToUiThread("GeckoViewSupport::Transfer",
+                     [compositor = GeckoSession::Compositor::GlobalRef(
+                          compositor)] { compositor->OnCompositorAttached(); });
+}
+
+void GeckoViewSupport::AttachEditable(
+    const GeckoSession::Window::LocalRef& inst,
+    jni::Object::Param aEditableParent) {
+  if (auto win{mWindow->mEditableSupport.Access()}) {
+    win->TransferParent(aEditableParent);
+  } else {
+    auto editableChild = java::GeckoEditableChild::New(aEditableParent,
+                                                       /* default */ true);
+    mWindow->mEditableSupport =
+        jni::NativeWeakPtrHolder<GeckoEditableSupport>::Attach(
+            editableChild, mWindow->mGeckoViewSupport, editableChild);
+  }
+
+  mWindow->mEditableParent = aEditableParent;
+}
+
+void GeckoViewSupport::AttachAccessibility(
+    const GeckoSession::Window::LocalRef& inst,
+    jni::Object::Param aSessionAccessibility) {
+  java::SessionAccessibility::NativeProvider::LocalRef sessionAccessibility(
+      inst.Env());
+  sessionAccessibility = java::SessionAccessibility::NativeProvider::Ref::From(
+      aSessionAccessibility);
+
+  mWindow->mSessionAccessibility =
+      jni::NativeWeakPtrHolder<a11y::SessionAccessibility>::Attach(
+          sessionAccessibility, mWindow->mGeckoViewSupport,
+          sessionAccessibility);
+}
+
+auto GeckoViewSupport::OnLoadRequest(mozilla::jni::String::Param aUri,
+                                     int32_t aWindowType, int32_t aFlags,
+                                     mozilla::jni::String::Param aTriggeringUri,
+                                     bool aHasUserGesture,
+                                     bool aIsTopLevel) const
+    -> java::GeckoResult::LocalRef {
+  GeckoSession::Window::LocalRef window(mGeckoViewWindow);
+  if (!window) {
+    return nullptr;
+  }
+  return window->OnLoadRequest(aUri, aWindowType, aFlags, aTriggeringUri,
+                               aHasUserGesture, aIsTopLevel);
+}
+
+void GeckoViewSupport::OnShowDynamicToolbar() const {
+  GeckoSession::Window::LocalRef window(mGeckoViewWindow);
+  if (!window) {
+    return;
+  }
+
+  window->OnShowDynamicToolbar();
+}
+
+void GeckoViewSupport::OnReady(jni::Object::Param aQueue) {
+  GeckoSession::Window::LocalRef window(mGeckoViewWindow);
+  if (!window) {
+    return;
+  }
+  window->OnReady(aQueue);
+  mIsReady = true;
+}
+
+void GeckoViewSupport::PassExternalResponse(
+    java::WebResponse::Param aResponse) {
+  GeckoSession::Window::LocalRef window(mGeckoViewWindow);
+  if (!window) {
+    return;
+  }
+
+  auto response = java::WebResponse::GlobalRef(aResponse);
+
+  DispatchToUiThread("GeckoViewSupport::PassExternalResponse",
+                     [window = java::GeckoSession::Window::GlobalRef(window),
+                      response] { window->PassExternalWebResponse(response); });
+}
+
+RefPtr<CanonicalBrowsingContext>
+GeckoViewSupport::GetContentCanonicalBrowsingContext() {
+  nsCOMPtr<nsIDocShellTreeOwner> treeOwner = mDOMWindow->GetTreeOwner();
+  if (!treeOwner) {
+    return nullptr;
+  }
+  RefPtr<BrowsingContext> bc;
+  nsresult rv = treeOwner->GetPrimaryContentBrowsingContext(getter_AddRefs(bc));
+  if (NS_WARN_IF(NS_FAILED(rv)) || !bc) {
+    return nullptr;
+  }
+  return bc->Canonical();
+}
+
+void GeckoViewSupport::CreatePdf(
+    jni::LocalRef<mozilla::java::GeckoResult> aGeckoResult,
+    RefPtr<dom::CanonicalBrowsingContext> aCbc) {
+  MOZ_ASSERT(NS_IsMainThread());
+  const auto pdfErrorMsg = "Could not save this page as PDF.";
+  auto stream = java::GeckoInputStream::New(nullptr);
+  RefPtr<GeckoViewOutputStream> streamListener =
+      new GeckoViewOutputStream(stream);
+
+  nsCOMPtr<nsIPrintSettingsService> printSettingsService =
+      do_GetService("@mozilla.org/gfx/printsettings-service;1");
+  if (!printSettingsService) {
+    aGeckoResult->CompleteExceptionally(
+        GeckoPrintException::New(
+            GeckoPrintException::ERROR_PRINT_SETTINGS_SERVICE_NOT_AVAILABLE)
+            .Cast<jni::Throwable>());
+    GVS_LOG("Could not create print settings service.");
+    return;
+  }
+
+  nsCOMPtr<nsIPrintSettings> printSettings;
+  nsresult rv = printSettingsService->CreateNewPrintSettings(
+      getter_AddRefs(printSettings));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aGeckoResult->CompleteExceptionally(
+        GeckoPrintException::New(
+            GeckoPrintException::ERROR_UNABLE_TO_CREATE_PRINT_SETTINGS)
+            .Cast<jni::Throwable>());
+    GVS_LOG("Could not create print settings.");
+    return;
+  }
+
+  printSettings->SetPrinterName(u"Mozilla Save to PDF"_ns);
+  printSettings->SetOutputDestination(
+      nsIPrintSettings::kOutputDestinationStream);
+  printSettings->SetOutputFormat(nsIPrintSettings::kOutputFormatPDF);
+  printSettings->SetOutputStream(streamListener);
+  printSettings->SetPrintSilent(true);
+
+  RefPtr<CanonicalBrowsingContext::PrintPromise> print =
+      aCbc->Print(printSettings);
+
+  aGeckoResult->Complete(stream);
+  print->Then(
+      mozilla::GetCurrentSerialEventTarget(), __func__,
+      [result = java::GeckoResult::GlobalRef(aGeckoResult), stream,
+       pdfErrorMsg](
+          const CanonicalBrowsingContext::PrintPromise::ResolveOrRejectValue&
+              aValue) {
+        if (aValue.IsReject()) {
+          GVS_LOG("Could not print. %s", pdfErrorMsg);
+          stream->WriteError();
+        }
+      });
+}
+
+void GeckoViewSupport::PrintToPdf(
+    const java::GeckoSession::Window::LocalRef& inst,
+    jni::Object::Param aResult) {
+  auto geckoResult = java::GeckoResult::Ref::From(aResult);
+  RefPtr<CanonicalBrowsingContext> cbc = GetContentCanonicalBrowsingContext();
+  if (!cbc) {
+    geckoResult->CompleteExceptionally(
+        GeckoPrintException::New(
+            GeckoPrintException::
+                ERROR_UNABLE_TO_RETRIEVE_CANONICAL_BROWSING_CONTEXT)
+            .Cast<jni::Throwable>());
+    GVS_LOG("Could not retrieve content canonical browsing context.");
+    return;
+  }
+  CreatePdf(geckoResult, cbc);
+}
+
+void GeckoViewSupport::PrintToPdf(
+    const java::GeckoSession::Window::LocalRef& inst,
+    jni::Object::Param aResult, int64_t aBcId) {
+  auto geckoResult = java::GeckoResult::Ref::From(aResult);
+
+  RefPtr<CanonicalBrowsingContext> cbc = CanonicalBrowsingContext::Get(aBcId);
+  if (!cbc) {
+    geckoResult->CompleteExceptionally(
+        GeckoPrintException::New(
+            GeckoPrintException::
+                ERROR_UNABLE_TO_RETRIEVE_CANONICAL_BROWSING_CONTEXT)
+            .Cast<jni::Throwable>());
+    GVS_LOG("Could not retrieve content canonical browsing context by ID.");
+    return;
+  }
+  CreatePdf(geckoResult, cbc);
+}
+}  // namespace widget
+}  // namespace mozilla
+
+void nsWindow::InitNatives() {
+  jni::InitConversionStatics();
+  mozilla::widget::GeckoViewSupport::Base::Init();
+  mozilla::widget::LayerViewSupport::Init();
+  mozilla::widget::NPZCSupport::Init();
+
+  mozilla::widget::GeckoEditableSupport::Init();
+  a11y::SessionAccessibility::Init();
+}
+
+void nsWindow::DetachNatives() {
+  MOZ_ASSERT(NS_IsMainThread());
+  mEditableSupport.Detach();
+  mNPZCSupport.Detach();
+  mLayerViewSupport.Detach();
+  mSessionAccessibility.Detach();
+}
+
+/* static */
+already_AddRefed<nsWindow> nsWindow::From(nsPIDOMWindowOuter* aDOMWindow) {
+  nsCOMPtr<nsIWidget> widget = WidgetUtils::DOMWindowToWidget(aDOMWindow);
+  return From(widget);
+}
+
+/* static */
+already_AddRefed<nsWindow> nsWindow::From(nsIWidget* aWidget) {
+  // `widget` may be one of several different types in the parent
+  // process, including the Android nsWindow, PuppetWidget, etc. To
+  // ensure that the cast to the Android nsWindow is valid, we check that the
+  // widget is a top-level window and that its NS_NATIVE_WIDGET value is
+  // non-null, which is not the case for non-native widgets like
+  // PuppetWidget.
+  if (aWidget && aWidget->GetWindowType() == WindowType::TopLevel &&
+      aWidget->GetNativeData(NS_NATIVE_WIDGET) == aWidget) {
+    RefPtr<nsWindow> window = static_cast<nsWindow*>(aWidget);
+    return window.forget();
+  }
+  return nullptr;
+}
+
+nsWindow* nsWindow::TopWindow() {
+  if (!gTopLevelWindows.IsEmpty()) return gTopLevelWindows[0];
+  return nullptr;
+}
+
+void nsWindow::LogWindow(nsWindow* win, int index, int indent) {
+#if defined(DEBUG) || defined(FORCE_ALOG)
+  char spaces[] = "                    ";
+  spaces[indent < 20 ? indent : 20] = 0;
+  ALOG("%s [% 2d] 0x%p [parent 0x%p] [% 3d,% 3dx% 3d,% 3d] vis %d type %d",
+       spaces, index, win, win->mParent, win->mBounds.x, win->mBounds.y,
+       win->mBounds.width, win->mBounds.height, win->mIsVisible,
+       int(win->mWindowType));
+#endif
+}
+
+void nsWindow::DumpWindows() { DumpWindows(gTopLevelWindows); }
+
+void nsWindow::DumpWindows(const nsTArray<nsWindow*>& wins, int indent) {
+  for (uint32_t i = 0; i < wins.Length(); ++i) {
+    nsWindow* w = wins[i];
+    LogWindow(w, i, indent);
+    DumpWindows(w->mChildren, indent + 1);
+  }
+}
+
+nsWindow::nsWindow()
+    : mWidgetId(++sWidgetId),
+      mIsVisible(false),
+      mParent(nullptr),
+      mDynamicToolbarMaxHeight(0),
+      mSizeMode(nsSizeMode_Normal),
+      mIsFullScreen(false),
+      mCompositorWidgetDelegate(nullptr),
+      mDestroyMutex("nsWindow::mDestroyMutex") {}
+
+nsWindow::~nsWindow() {
+  gTopLevelWindows.RemoveElement(this);
+  ALOG("nsWindow %p destructor", (void*)this);
+  // The mCompositorSession should have been cleaned up in nsWindow::Destroy()
+  // DestroyLayerManager() will call DestroyCompositor() which will crash if
+  // called from nsBaseWidget destructor. See Bug 1392705
+  MOZ_ASSERT(!mCompositorSession);
+}
+
+bool nsWindow::IsTopLevel() {
+  return mWindowType == WindowType::TopLevel ||
+         mWindowType == WindowType::Dialog ||
+         mWindowType == WindowType::Invisible;
+}
+
+nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
+                          const LayoutDeviceIntRect& aRect,
+                          InitData* aInitData) {
+  ALOG("nsWindow[%p]::Create %p [%d %d %d %d]", (void*)this, (void*)aParent,
+       aRect.x, aRect.y, aRect.width, aRect.height);
+
+  nsWindow* parent = (nsWindow*)aParent;
+  if (aNativeParent) {
+    if (parent) {
+      ALOG(
+          "Ignoring native parent on Android window [%p], "
+          "since parent was specified (%p %p)",
+          (void*)this, (void*)aNativeParent, (void*)aParent);
+    } else {
+      parent = (nsWindow*)aNativeParent;
+    }
+  }
+
+  // A default size of 1x1 confuses MobileViewportManager, so
+  // use 0x0 instead. This is also a little more fitting since
+  // we don't yet have a surface yet (and therefore a valid size)
+  // and 0x0 is usually recognized as invalid.
+  LayoutDeviceIntRect rect = aRect;
+  if (aRect.width == 1 && aRect.height == 1) {
+    rect.width = 0;
+    rect.height = 0;
+  }
+
+  mBounds = rect;
+  SetSizeConstraints(SizeConstraints());
+
+  BaseCreate(nullptr, aInitData);
+
+  NS_ASSERTION(IsTopLevel() || parent,
+               "non-top-level window doesn't have a parent!");
+
+  if (IsTopLevel()) {
+    gTopLevelWindows.AppendElement(this);
+
+  } else if (parent) {
+    parent->mChildren.AppendElement(this);
+    mParent = parent;
+  }
+
+#ifdef DEBUG_ANDROID_WIDGET
+  DumpWindows();
+#endif
+
+  return NS_OK;
+}
+
+void nsWindow::Destroy() {
+  MutexAutoLock lock(mDestroyMutex);
+
+  nsBaseWidget::mOnDestroyCalled = true;
+
+  // Disassociate our native object from GeckoView.
+  mGeckoViewSupport.Detach();
+
+  // Stuff below may release the last ref to this
+  nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
+
+  while (mChildren.Length()) {
+    // why do we still have children?
+    ALOG("### Warning: Destroying window %p and reparenting child %p to null!",
+         (void*)this, (void*)mChildren[0]);
+    mChildren[0]->SetParent(nullptr);
+  }
+
+  // Ensure the compositor has been shutdown before this nsWindow is potentially
+  // deleted
+  nsBaseWidget::DestroyCompositor();
+
+  nsBaseWidget::Destroy();
+
+  if (IsTopLevel()) gTopLevelWindows.RemoveElement(this);
+
+  SetParent(nullptr);
+
+  nsBaseWidget::OnDestroy();
+
+#ifdef DEBUG_ANDROID_WIDGET
+  DumpWindows();
+#endif
+}
+
+mozilla::widget::EventDispatcher* nsWindow::GetEventDispatcher() const {
+  if (mAndroidView) {
+    return mAndroidView->mEventDispatcher;
+  }
+  return nullptr;
+}
+
+void nsWindow::RedrawAll() {
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->RequestRepaint();
+  } else if (mWidgetListener) {
+    mWidgetListener->RequestRepaint();
+  }
+}
+
+RefPtr<UiCompositorControllerChild> nsWindow::GetUiCompositorControllerChild() {
+  return mCompositorSession
+             ? mCompositorSession->GetUiCompositorControllerChild()
+             : nullptr;
+}
+
+mozilla::layers::LayersId nsWindow::GetRootLayerId() const {
+  return mCompositorSession ? mCompositorSession->RootLayerTreeId()
+                            : mozilla::layers::LayersId{0};
+}
+
+void nsWindow::OnGeckoViewReady() {
+  auto acc(mGeckoViewSupport.Access());
+  if (!acc) {
+    return;
+  }
+
+  acc->OnReady();
+}
+
+void nsWindow::SetParent(nsIWidget* aNewParent) {
+  if ((nsIWidget*)mParent == aNewParent) return;
+
+  // If we had a parent before, remove ourselves from its list of
+  // children.
+  if (mParent) mParent->mChildren.RemoveElement(this);
+
+  mParent = (nsWindow*)aNewParent;
+
+  if (mParent) mParent->mChildren.AppendElement(this);
+
+  // if we are now in the toplevel window's hierarchy, schedule a redraw
+  if (FindTopLevel() == nsWindow::TopWindow()) RedrawAll();
+}
+
+nsIWidget* nsWindow::GetParent() { return mParent; }
+
+RefPtr<MozPromise<bool, bool, false>> nsWindow::OnLoadRequest(
+    nsIURI* aUri, int32_t aWindowType, int32_t aFlags,
+    nsIPrincipal* aTriggeringPrincipal, bool aHasUserGesture,
+    bool aIsTopLevel) {
+  auto geckoViewSupport(mGeckoViewSupport.Access());
+  if (!geckoViewSupport) {
+    return MozPromise<bool, bool, false>::CreateAndResolve(false, __func__);
+  }
+
+  nsAutoCString spec, triggeringSpec;
+  if (aUri) {
+    aUri->GetDisplaySpec(spec);
+    if (aIsTopLevel && mozilla::net::SchemeIsData(aUri) &&
+        spec.Length() > MAX_TOPLEVEL_DATA_URI_LEN) {
+      return MozPromise<bool, bool, false>::CreateAndResolve(false, __func__);
+    }
+  }
+
+  bool isNullPrincipal = false;
+  if (aTriggeringPrincipal) {
+    aTriggeringPrincipal->GetIsNullPrincipal(&isNullPrincipal);
+
+    if (!isNullPrincipal) {
+      nsCOMPtr<nsIURI> triggeringUri;
+      BasePrincipal::Cast(aTriggeringPrincipal)
+          ->GetURI(getter_AddRefs(triggeringUri));
+      if (triggeringUri) {
+        triggeringUri->GetDisplaySpec(triggeringSpec);
+      }
+    }
+  }
+
+  auto geckoResult = geckoViewSupport->OnLoadRequest(
+      spec.get(), aWindowType, aFlags,
+      isNullPrincipal ? nullptr : triggeringSpec.get(), aHasUserGesture,
+      aIsTopLevel);
+  return geckoResult
+             ? MozPromise<bool, bool, false>::FromGeckoResult(geckoResult)
+             : nullptr;
+}
+
+void nsWindow::OnUpdateSessionStore(mozilla::jni::Object::Param aBundle) {
+  auto geckoViewSupport(mGeckoViewSupport.Access());
+  if (!geckoViewSupport) {
+    return;
+  }
+
+  geckoViewSupport->OnUpdateSessionStore(aBundle);
+}
+
+float nsWindow::GetDPI() {
+  float dpi = 160.0f;
+
+  nsCOMPtr<nsIScreen> screen = GetWidgetScreen();
+  if (screen) {
+    screen->GetDpi(&dpi);
+  }
+
+  return dpi;
+}
+
+double nsWindow::GetDefaultScaleInternal() {
+  double scale = 1.0f;
+
+  nsCOMPtr<nsIScreen> screen = GetWidgetScreen();
+  if (screen) {
+    screen->GetContentsScaleFactor(&scale);
+  }
+
+  return scale;
+}
+
+void nsWindow::Show(bool aState) {
+  ALOG("nsWindow[%p]::Show %d", (void*)this, aState);
+
+  if (mWindowType == WindowType::Invisible) {
+    ALOG("trying to show invisible window! ignoring..");
+    return;
+  }
+
+  if (aState == mIsVisible) return;
+
+  mIsVisible = aState;
+
+  if (IsTopLevel()) {
+    // XXX should we bring this to the front when it's shown,
+    // if it's a toplevel widget?
+
+    // XXX we should synthesize a eMouseExitFromWidget (for old top
+    // window)/eMouseEnterIntoWidget (for new top window) since we need
+    // to pretend that the top window always has focus.  Not sure
+    // if Show() is the right place to do this, though.
+
+    if (aState) {
+      // It just became visible, so bring it to the front.
+      BringToFront();
+
+    } else if (nsWindow::TopWindow() == this) {
+      // find the next visible window to show
+      unsigned int i;
+      for (i = 1; i < gTopLevelWindows.Length(); i++) {
+        nsWindow* win = gTopLevelWindows[i];
+        if (!win->mIsVisible) continue;
+
+        win->BringToFront();
+        break;
+      }
+    }
+  } else if (FindTopLevel() == nsWindow::TopWindow()) {
+    RedrawAll();
+  }
+
+#ifdef DEBUG_ANDROID_WIDGET
+  DumpWindows();
+#endif
+}
+
+bool nsWindow::IsVisible() const { return mIsVisible; }
+
+void nsWindow::ConstrainPosition(DesktopIntPoint& aPoint) {
+  ALOG("nsWindow[%p]::ConstrainPosition [%d %d]", (void*)this, aPoint.x.value,
+       aPoint.y.value);
+
+  // Constrain toplevel windows; children we don't care about
+  if (IsTopLevel()) {
+    aPoint = DesktopIntPoint();
+  }
+}
+
+void nsWindow::Move(double aX, double aY) {
+  if (IsTopLevel()) return;
+
+  Resize(aX, aY, mBounds.width, mBounds.height, true);
+}
+
+void nsWindow::Resize(double aWidth, double aHeight, bool aRepaint) {
+  Resize(mBounds.x, mBounds.y, aWidth, aHeight, aRepaint);
+}
+
+void nsWindow::Resize(double aX, double aY, double aWidth, double aHeight,
+                      bool aRepaint) {
+  ALOG("nsWindow[%p]::Resize [%f %f %f %f] (repaint %d)", (void*)this, aX, aY,
+       aWidth, aHeight, aRepaint);
+
+  LayoutDeviceIntRect oldBounds = mBounds;
+
+  mBounds.x = NSToIntRound(aX);
+  mBounds.y = NSToIntRound(aY);
+  mBounds.width = NSToIntRound(aWidth);
+  mBounds.height = NSToIntRound(aHeight);
+
+  ConstrainSize(&mBounds.width, &mBounds.height);
+
+  bool needPositionDispatch = mBounds.TopLeft() != oldBounds.TopLeft();
+  bool needSizeDispatch = mBounds.Size() != oldBounds.Size();
+
+  if (needSizeDispatch) {
+    OnSizeChanged(mBounds.Size().ToUnknownSize());
+  }
+
+  if (needPositionDispatch) {
+    NotifyWindowMoved(mBounds.x, mBounds.y);
+  }
+
+  // Should we skip honoring aRepaint here?
+  if (aRepaint && FindTopLevel() == nsWindow::TopWindow()) RedrawAll();
+}
+
+void nsWindow::SetZIndex(int32_t aZIndex) {
+  ALOG("nsWindow[%p]::SetZIndex %d ignored", (void*)this, aZIndex);
+}
+
+void nsWindow::SetSizeMode(nsSizeMode aMode) {
+  if (aMode == mSizeMode) {
+    return;
+  }
+
+  mSizeMode = aMode;
+
+  switch (aMode) {
+    case nsSizeMode_Minimized:
+      java::GeckoAppShell::MoveTaskToBack();
+      break;
+    case nsSizeMode_Fullscreen:
+      MakeFullScreen(true);
+      break;
+    default:
+      break;
+  }
+}
+
+void nsWindow::Enable(bool aState) {
+  ALOG("nsWindow[%p]::Enable %d ignored", (void*)this, aState);
+}
+
+bool nsWindow::IsEnabled() const { return true; }
+
+void nsWindow::Invalidate(const LayoutDeviceIntRect& aRect) {}
+
+nsWindow* nsWindow::FindTopLevel() {
+  nsWindow* toplevel = this;
+  while (toplevel) {
+    if (toplevel->IsTopLevel()) return toplevel;
+
+    toplevel = toplevel->mParent;
+  }
+
+  ALOG(
+      "nsWindow::FindTopLevel(): couldn't find a toplevel or dialog window in "
+      "this [%p] widget's hierarchy!",
+      (void*)this);
+  return this;
+}
+
+void nsWindow::SetFocus(Raise, mozilla::dom::CallerType aCallerType) {
+  FindTopLevel()->BringToFront();
+}
+
+void nsWindow::BringToFront() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  // If the window to be raised is the same as the currently raised one,
+  // do nothing. We need to check the focus manager as well, as the first
+  // window that is created will be first in the window list but won't yet
+  // be focused.
+  nsFocusManager* fm = nsFocusManager::GetFocusManager();
+  if (fm && fm->GetActiveWindow() && FindTopLevel() == nsWindow::TopWindow()) {
+    return;
+  }
+
+  if (!IsTopLevel()) {
+    FindTopLevel()->BringToFront();
+    return;
+  }
+
+  RefPtr<nsWindow> kungFuDeathGrip(this);
+
+  nsWindow* oldTop = nullptr;
+  if (!gTopLevelWindows.IsEmpty()) {
+    oldTop = gTopLevelWindows[0];
+  }
+
+  gTopLevelWindows.RemoveElement(this);
+  gTopLevelWindows.InsertElementAt(0, this);
+
+  if (oldTop) {
+    nsIWidgetListener* listener = oldTop->GetWidgetListener();
+    if (listener) {
+      listener->WindowDeactivated();
+    }
+  }
+
+  if (mWidgetListener) {
+    mWidgetListener->WindowActivated();
+  }
+
+  RedrawAll();
+}
+
+LayoutDeviceIntRect nsWindow::GetScreenBounds() {
+  return LayoutDeviceIntRect(WidgetToScreenOffset(), mBounds.Size());
+}
+
+LayoutDeviceIntPoint nsWindow::WidgetToScreenOffset() {
+  LayoutDeviceIntPoint p(0, 0);
+
+  for (nsWindow* w = this; !!w; w = w->mParent) {
+    p.x += w->mBounds.x;
+    p.y += w->mBounds.y;
+
+    if (w->IsTopLevel()) {
+      break;
+    }
+  }
+  return p;
+}
+
+nsresult nsWindow::DispatchEvent(WidgetGUIEvent* aEvent,
+                                 nsEventStatus& aStatus) {
+  aStatus = DispatchEvent(aEvent);
+  return NS_OK;
+}
+
+nsEventStatus nsWindow::DispatchEvent(WidgetGUIEvent* aEvent) {
+  if (mAttachedWidgetListener) {
+    return mAttachedWidgetListener->HandleEvent(aEvent, mUseAttachedEvents);
+  } else if (mWidgetListener) {
+    return mWidgetListener->HandleEvent(aEvent, mUseAttachedEvents);
+  }
+  return nsEventStatus_eIgnore;
+}
+
+nsresult nsWindow::MakeFullScreen(bool aFullScreen) {
+  if (!mAndroidView) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  mIsFullScreen = aFullScreen;
+  mAndroidView->mEventDispatcher->Dispatch(
+      aFullScreen ? u"GeckoView:FullScreenEnter" : u"GeckoView:FullScreenExit");
+
+  nsIWidgetListener* listener = GetWidgetListener();
+  if (listener) {
+    mSizeMode = mIsFullScreen ? nsSizeMode_Fullscreen : nsSizeMode_Normal;
+    listener->SizeModeChanged(mSizeMode);
+  }
+  return NS_OK;
+}
+
+mozilla::WindowRenderer* nsWindow::GetWindowRenderer() {
+  if (!mWindowRenderer) {
+    CreateLayerManager();
+  }
+
+  return mWindowRenderer;
+}
+
+void nsWindow::CreateLayerManager() {
+  if (mWindowRenderer) {
+    return;
+  }
+
+  nsWindow* topLevelWindow = FindTopLevel();
+  if (!topLevelWindow || topLevelWindow->mWindowType == WindowType::Invisible) {
+    // don't create a layer manager for an invisible top-level window
+    return;
+  }
+
+  // Ensure that gfxPlatform is initialized first.
+  gfxPlatform::GetPlatform();
+
+  if (ShouldUseOffMainThreadCompositing()) {
+    LayoutDeviceIntRect rect = GetBounds();
+    CreateCompositor(rect.Width(), rect.Height());
+    if (mWindowRenderer) {
+      if (mLayerViewSupport.IsAttached()) {
+        DispatchToUiThread(
+            "LayerViewSupport::NotifyCompositorCreated",
+            [lvs = mLayerViewSupport,
+             uiCompositorController = GetUiCompositorControllerChild()] {
+              if (auto lvsAccess{lvs.Access()}) {
+                lvsAccess->NotifyCompositorCreated(uiCompositorController);
+              }
+            });
+      }
+
+      return;
+    }
+
+    // If we get here, then off main thread compositing failed to initialize.
+    sFailedToCreateGLContext = true;
+  }
+
+  if (!ComputeShouldAccelerate() || sFailedToCreateGLContext) {
+    printf_stderr(" -- creating basic, not accelerated\n");
+    mWindowRenderer = CreateFallbackRenderer();
+  }
+}
+
+void nsWindow::NotifyCompositorSessionLost(
+    mozilla::layers::CompositorSession* aSession) {
+  nsBaseWidget::NotifyCompositorSessionLost(aSession);
+
+  DispatchToUiThread("nsWindow::NotifyCompositorSessionLost",
+                     [lvs = mLayerViewSupport] {
+                       if (auto lvsAccess{lvs.Access()}) {
+                         lvsAccess->NotifyCompositorSessionLost();
+                       }
+                     });
+
+  RedrawAll();
+}
+
+void nsWindow::ShowDynamicToolbar() {
+  auto acc(mGeckoViewSupport.Access());
+  if (!acc) {
+    return;
+  }
+
+  acc->OnShowDynamicToolbar();
+}
+
+void GeckoViewSupport::OnUpdateSessionStore(
+    mozilla::jni::Object::Param aBundle) {
+  GeckoSession::Window::LocalRef window(mGeckoViewWindow);
+  if (!window) {
+    return;
+  }
+
+  window->OnUpdateSessionStore(aBundle);
+}
+
+void nsWindow::OnSizeChanged(const gfx::IntSize& aSize) {
+  ALOG("nsWindow: %p OnSizeChanged [%d %d]", (void*)this, aSize.width,
+       aSize.height);
+
+  if (mWidgetListener) {
+    mWidgetListener->WindowResized(this, aSize.width, aSize.height);
+  }
+
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->WindowResized(this, aSize.width, aSize.height);
+  }
+
+  if (mCompositorWidgetDelegate) {
+    mCompositorWidgetDelegate->NotifyClientSizeChanged(
+        LayoutDeviceIntSize::FromUnknownSize(aSize));
+  }
+}
+
+void nsWindow::InitEvent(WidgetGUIEvent& event, LayoutDeviceIntPoint* aPoint) {
+  if (aPoint) {
+    event.mRefPoint = *aPoint;
+  } else {
+    event.mRefPoint = LayoutDeviceIntPoint(0, 0);
+  }
+}
+
+void nsWindow::UpdateOverscrollVelocity(const float aX, const float aY) {
+  if (::mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+          mLayerViewSupport.Access()}) {
+    const auto& compositor = lvs->GetJavaCompositor();
+    if (AndroidBridge::IsJavaUiThread()) {
+      compositor->UpdateOverscrollVelocity(aX, aY);
+      return;
+    }
+
+    DispatchToUiThread(
+        "nsWindow::UpdateOverscrollVelocity",
+        [compositor = GeckoSession::Compositor::GlobalRef(compositor), aX, aY] {
+          compositor->UpdateOverscrollVelocity(aX, aY);
+        });
+  }
+}
+
+void nsWindow::UpdateOverscrollOffset(const float aX, const float aY) {
+  if (::mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+          mLayerViewSupport.Access()}) {
+    const auto& compositor = lvs->GetJavaCompositor();
+    if (AndroidBridge::IsJavaUiThread()) {
+      compositor->UpdateOverscrollOffset(aX, aY);
+      return;
+    }
+
+    DispatchToUiThread(
+        "nsWindow::UpdateOverscrollOffset",
+        [compositor = GeckoSession::Compositor::GlobalRef(compositor), aX, aY] {
+          compositor->UpdateOverscrollOffset(aX, aY);
+        });
+  }
+}
+
+void* nsWindow::GetNativeData(uint32_t aDataType) {
+  switch (aDataType) {
+    // used by GLContextProviderEGL, nullptr is EGL_DEFAULT_DISPLAY
+    case NS_NATIVE_WIDGET:
+      return (void*)this;
+
+    case NS_RAW_NATIVE_IME_CONTEXT: {
+      void* pseudoIMEContext = GetPseudoIMEContext();
+      if (pseudoIMEContext) {
+        return pseudoIMEContext;
+      }
+      // We assume that there is only one context per process on Android
+      return NS_ONLY_ONE_NATIVE_IME_CONTEXT;
+    }
+
+    case NS_JAVA_SURFACE:
+      if (::mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+              mLayerViewSupport.Access()}) {
+        return lvs->GetSurface().Get();
+      }
+      return nullptr;
+  }
+
+  return nullptr;
+}
+
+void nsWindow::DispatchHitTest(const WidgetTouchEvent& aEvent) {
+  if (aEvent.mMessage == eTouchStart && aEvent.mTouches.Length() == 1) {
+    // Since touch events don't get retargeted by PositionedEventTargeting.cpp
+    // code, we dispatch a dummy mouse event that *does* get retargeted.
+    // Front-end code can use this to activate the highlight element in case
+    // this touchstart is the start of a tap.
+    WidgetMouseEvent hittest(true, eMouseHitTest, this,
+                             WidgetMouseEvent::eReal);
+    hittest.mRefPoint = aEvent.mTouches[0]->mRefPoint;
+    hittest.mInputSource = MouseEvent_Binding::MOZ_SOURCE_TOUCH;
+    nsEventStatus status;
+    DispatchEvent(&hittest, status);
+  }
+}
+
+void nsWindow::PassExternalResponse(java::WebResponse::Param aResponse) {
+  auto acc(mGeckoViewSupport.Access());
+  if (!acc) {
+    return;
+  }
+
+  acc->PassExternalResponse(aResponse);
+}
+
+mozilla::Modifiers nsWindow::GetModifiers(int32_t metaState) {
+  using mozilla::java::sdk::KeyEvent;
+  return (metaState & KeyEvent::META_ALT_MASK ? MODIFIER_ALT : 0) |
+         (metaState & KeyEvent::META_SHIFT_MASK ? MODIFIER_SHIFT : 0) |
+         (metaState & KeyEvent::META_CTRL_MASK ? MODIFIER_CONTROL : 0) |
+         (metaState & KeyEvent::META_META_MASK ? MODIFIER_META : 0) |
+         (metaState & KeyEvent::META_FUNCTION_ON ? MODIFIER_FN : 0) |
+         (metaState & KeyEvent::META_CAPS_LOCK_ON ? MODIFIER_CAPSLOCK : 0) |
+         (metaState & KeyEvent::META_NUM_LOCK_ON ? MODIFIER_NUMLOCK : 0) |
+         (metaState & KeyEvent::META_SCROLL_LOCK_ON ? MODIFIER_SCROLLLOCK : 0);
+}
+
+TimeStamp nsWindow::GetEventTimeStamp(int64_t aEventTime) {
+  // Android's event time is SystemClock.uptimeMillis that is counted in ms
+  // since OS was booted.
+  // (https://developer.android.com/reference/android/os/SystemClock.html)
+  // and this SystemClock.uptimeMillis uses SYSTEM_TIME_MONOTONIC.
+  // Our posix implemententaion of TimeStamp::Now uses SYSTEM_TIME_MONOTONIC
+  //  too. Due to same implementation, we can use this via FromSystemTime.
+  int64_t tick =
+      BaseTimeDurationPlatformUtils::TicksFromMilliseconds(aEventTime);
+  return TimeStamp::FromSystemTime(tick);
+}
+
+void nsWindow::UserActivity() {
+  if (!mIdleService) {
+    mIdleService = do_GetService("@mozilla.org/widget/useridleservice;1");
+  }
+
+  if (mIdleService) {
+    mIdleService->ResetIdleTimeOut(0);
+  }
+
+  if (FindTopLevel() != nsWindow::TopWindow()) {
+    BringToFront();
+  }
+}
+
+RefPtr<mozilla::a11y::SessionAccessibility>
+nsWindow::GetSessionAccessibility() {
+  auto acc(mSessionAccessibility.Access());
+  if (!acc) {
+    return nullptr;
+  }
+
+  return acc.AsRefPtr();
+}
+
+TextEventDispatcherListener* nsWindow::GetNativeTextEventDispatcherListener() {
+  nsWindow* top = FindTopLevel();
+  MOZ_ASSERT(top);
+
+  auto acc(top->mEditableSupport.Access());
+  if (!acc) {
+    // Non-GeckoView windows don't support IME operations.
+    return nullptr;
+  }
+
+  nsCOMPtr<TextEventDispatcherListener> ptr;
+  if (NS_FAILED(acc->QueryInterface(NS_GET_IID(TextEventDispatcherListener),
+                                    getter_AddRefs(ptr)))) {
+    return nullptr;
+  }
+
+  return ptr.get();
+}
+
+void nsWindow::SetInputContext(const InputContext& aContext,
+                               const InputContextAction& aAction) {
+  nsWindow* top = FindTopLevel();
+  MOZ_ASSERT(top);
+
+  auto acc(top->mEditableSupport.Access());
+  if (!acc) {
+    // Non-GeckoView windows don't support IME operations.
+    return;
+  }
+
+  // We are using an IME event later to notify Java, and the IME event
+  // will be processed by the top window. Therefore, to ensure the
+  // IME event uses the correct mInputContext, we need to let the top
+  // window process SetInputContext
+  acc->SetInputContext(aContext, aAction);
+}
+
+InputContext nsWindow::GetInputContext() {
+  nsWindow* top = FindTopLevel();
+  MOZ_ASSERT(top);
+
+  auto acc(top->mEditableSupport.Access());
+  if (!acc) {
+    // Non-GeckoView windows don't support IME operations.
+    return InputContext();
+  }
+
+  // We let the top window process SetInputContext,
+  // so we should let it process GetInputContext as well.
+  return acc->GetInputContext();
+}
+
+nsresult nsWindow::SynthesizeNativeTouchPoint(uint32_t aPointerId,
+                                              TouchPointerState aPointerState,
+                                              LayoutDeviceIntPoint aPoint,
+                                              double aPointerPressure,
+                                              uint32_t aPointerOrientation,
+                                              nsIObserver* aObserver) {
+  mozilla::widget::AutoObserverNotifier notifier(aObserver, "touchpoint");
+
+  int eventType;
+  switch (aPointerState) {
+    case TOUCH_CONTACT:
+      // This could be a ACTION_DOWN or ACTION_MOVE depending on the
+      // existing state; it is mapped to the right thing in Java.
+      eventType = java::sdk::MotionEvent::ACTION_POINTER_DOWN;
+      break;
+    case TOUCH_REMOVE:
+      // This could be turned into a ACTION_UP in Java
+      eventType = java::sdk::MotionEvent::ACTION_POINTER_UP;
+      break;
+    case TOUCH_CANCEL:
+      eventType = java::sdk::MotionEvent::ACTION_CANCEL;
+      break;
+    case TOUCH_HOVER:  // not supported for now
+    default:
+      return NS_ERROR_UNEXPECTED;
+  }
+
+  MOZ_ASSERT(mNPZCSupport.IsAttached());
+  auto npzcSup(mNPZCSupport.Access());
+  MOZ_ASSERT(!!npzcSup);
+
+  const auto& npzc = npzcSup->GetJavaNPZC();
+  const auto& bounds = FindTopLevel()->mBounds;
+  aPoint.x -= bounds.x;
+  aPoint.y -= bounds.y;
+
+  DispatchToUiThread(
+      "nsWindow::SynthesizeNativeTouchPoint",
+      [npzc = java::PanZoomController::NativeProvider::GlobalRef(npzc),
+       aPointerId, eventType, aPoint, aPointerPressure, aPointerOrientation] {
+        npzc->SynthesizeNativeTouchPoint(aPointerId, eventType, aPoint.x,
+                                         aPoint.y, aPointerPressure,
+                                         aPointerOrientation);
+      });
+  return NS_OK;
+}
+
+nsresult nsWindow::SynthesizeNativeMouseEvent(
+    LayoutDeviceIntPoint aPoint, NativeMouseMessage aNativeMessage,
+    MouseButton aButton, nsIWidget::Modifiers aModifierFlags,
+    nsIObserver* aObserver) {
+  mozilla::widget::AutoObserverNotifier notifier(aObserver, "mouseevent");
+
+  MOZ_ASSERT(mNPZCSupport.IsAttached());
+  auto npzcSup(mNPZCSupport.Access());
+  MOZ_ASSERT(!!npzcSup);
+
+  const auto& npzc = npzcSup->GetJavaNPZC();
+  const auto& bounds = FindTopLevel()->mBounds;
+  aPoint.x -= bounds.x;
+  aPoint.y -= bounds.y;
+
+  int32_t nativeMessage;
+  switch (aNativeMessage) {
+    case NativeMouseMessage::ButtonDown:
+      nativeMessage = java::sdk::MotionEvent::ACTION_POINTER_DOWN;
+      break;
+    case NativeMouseMessage::ButtonUp:
+      nativeMessage = java::sdk::MotionEvent::ACTION_POINTER_UP;
+      break;
+    case NativeMouseMessage::Move:
+      nativeMessage = java::sdk::MotionEvent::ACTION_HOVER_MOVE;
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Non supported mouse event on Android");
+      return NS_ERROR_INVALID_ARG;
+  }
+  int32_t button = 0;
+  if (aNativeMessage != NativeMouseMessage::ButtonUp) {
+    switch (aButton) {
+      case MouseButton::ePrimary:
+        button = java::sdk::MotionEvent::BUTTON_PRIMARY;
+        break;
+      case MouseButton::eMiddle:
+        button = java::sdk::MotionEvent::BUTTON_TERTIARY;
+        break;
+      case MouseButton::eSecondary:
+        button = java::sdk::MotionEvent::BUTTON_SECONDARY;
+        break;
+      case MouseButton::eX1:
+        button = java::sdk::MotionEvent::BUTTON_BACK;
+        break;
+      case MouseButton::eX2:
+        button = java::sdk::MotionEvent::BUTTON_FORWARD;
+        break;
+      default:
+        if (aNativeMessage == NativeMouseMessage::ButtonDown) {
+          MOZ_ASSERT_UNREACHABLE("Non supported mouse button type on Android");
+          return NS_ERROR_INVALID_ARG;
+        }
+        break;
+    }
+  }
+
+  // TODO (bug 1693237): Handle aModifierFlags.
+  DispatchToUiThread(
+      "nsWindow::SynthesizeNativeMouseEvent",
+      [npzc = java::PanZoomController::NativeProvider::GlobalRef(npzc),
+       nativeMessage, aPoint, button] {
+        npzc->SynthesizeNativeMouseEvent(nativeMessage, aPoint.x, aPoint.y,
+                                         button);
+      });
+  return NS_OK;
+}
+
+nsresult nsWindow::SynthesizeNativeMouseMove(LayoutDeviceIntPoint aPoint,
+                                             nsIObserver* aObserver) {
+  return SynthesizeNativeMouseEvent(
+      aPoint, NativeMouseMessage::Move, MouseButton::eNotPressed,
+      nsIWidget::Modifiers::NO_MODIFIERS, aObserver);
+}
+
+void nsWindow::SetCompositorWidgetDelegate(CompositorWidgetDelegate* delegate) {
+  if (delegate) {
+    mCompositorWidgetDelegate = delegate->AsPlatformSpecificDelegate();
+    MOZ_ASSERT(mCompositorWidgetDelegate,
+               "nsWindow::SetCompositorWidgetDelegate called with a "
+               "non-PlatformCompositorWidgetDelegate");
+  } else {
+    mCompositorWidgetDelegate = nullptr;
+  }
+}
+
+void nsWindow::GetCompositorWidgetInitData(
+    mozilla::widget::CompositorWidgetInitData* aInitData) {
+  *aInitData = mozilla::widget::AndroidCompositorWidgetInitData(
+      mWidgetId, GetClientSize());
+}
+
+bool nsWindow::WidgetPaintsBackground() {
+  return StaticPrefs::android_widget_paints_background();
+}
+
+bool nsWindow::NeedsPaint() {
+  auto lvs(mLayerViewSupport.Access());
+  if (!lvs || lvs->CompositorPaused() || !GetWindowRenderer()) {
+    return false;
+  }
+
+  return nsIWidget::NeedsPaint();
+}
+
+void nsWindow::ConfigureAPZControllerThread() {
+  nsCOMPtr<nsISerialEventTarget> thread = mozilla::GetAndroidUiThread();
+  APZThreadUtils::SetControllerThread(thread);
+}
+
+already_AddRefed<GeckoContentController>
+nsWindow::CreateRootContentController() {
+  RefPtr<GeckoContentController> controller =
+      new AndroidContentController(this, mAPZEventState, mAPZC);
+  return controller.forget();
+}
+
+uint32_t nsWindow::GetMaxTouchPoints() const {
+  return java::GeckoAppShell::GetMaxTouchPoints();
+}
+
+void nsWindow::UpdateZoomConstraints(
+    const uint32_t& aPresShellId, const ScrollableLayerGuid::ViewID& aViewId,
+    const mozilla::Maybe<ZoomConstraints>& aConstraints) {
+  nsBaseWidget::UpdateZoomConstraints(aPresShellId, aViewId, aConstraints);
+}
+
+CompositorBridgeChild* nsWindow::GetCompositorBridgeChild() const {
+  return mCompositorSession ? mCompositorSession->GetCompositorBridgeChild()
+                            : nullptr;
+}
+
+void nsWindow::SetContentDocumentDisplayed(bool aDisplayed) {
+  mContentDocumentDisplayed = aDisplayed;
+}
+
+bool nsWindow::IsContentDocumentDisplayed() {
+  return mContentDocumentDisplayed;
+}
+
+void nsWindow::RecvToolbarAnimatorMessageFromCompositor(int32_t aMessage) {
+  MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+  if (::mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+          mLayerViewSupport.Access()}) {
+    lvs->RecvToolbarAnimatorMessage(aMessage);
+  }
+}
+
+void nsWindow::UpdateRootFrameMetrics(const ScreenPoint& aScrollOffset,
+                                      const CSSToScreenScale& aZoom) {
+  MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+  if (::mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+          mLayerViewSupport.Access()}) {
+    const auto& compositor = lvs->GetJavaCompositor();
+    mContentDocumentDisplayed = true;
+    compositor->UpdateRootFrameMetrics(aScrollOffset.x, aScrollOffset.y,
+                                       aZoom.scale);
+  }
+}
+
+void nsWindow::RecvScreenPixels(Shmem&& aMem, const ScreenIntSize& aSize,
+                                bool aNeedsYFlip) {
+  MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
+  if (::mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+          mLayerViewSupport.Access()}) {
+    lvs->RecvScreenPixels(std::move(aMem), aSize, aNeedsYFlip);
+  }
+}
+
+void nsWindow::UpdateDynamicToolbarMaxHeight(ScreenIntCoord aHeight) {
+  if (mDynamicToolbarMaxHeight == aHeight) {
+    return;
+  }
+
+  mDynamicToolbarMaxHeight = aHeight;
+
+  if (mWidgetListener) {
+    mWidgetListener->DynamicToolbarMaxHeightChanged(aHeight);
+  }
+
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->DynamicToolbarMaxHeightChanged(aHeight);
+  }
+}
+
+void nsWindow::UpdateDynamicToolbarOffset(ScreenIntCoord aOffset) {
+  if (mWidgetListener) {
+    mWidgetListener->DynamicToolbarOffsetChanged(aOffset);
+  }
+
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->DynamicToolbarOffsetChanged(aOffset);
+  }
+}
+
+ScreenIntMargin nsWindow::GetSafeAreaInsets() const { return mSafeAreaInsets; }
+
+void nsWindow::UpdateSafeAreaInsets(const ScreenIntMargin& aSafeAreaInsets) {
+  mSafeAreaInsets = aSafeAreaInsets;
+
+  if (mWidgetListener) {
+    mWidgetListener->SafeAreaInsetsChanged(aSafeAreaInsets);
+  }
+
+  if (mAttachedWidgetListener) {
+    mAttachedWidgetListener->SafeAreaInsetsChanged(aSafeAreaInsets);
+  }
+}
+
+jni::NativeWeakPtr<NPZCSupport> nsWindow::GetNPZCSupportWeakPtr() {
+  return mNPZCSupport;
+}
+
+already_AddRefed<nsIWidget> nsIWidget::CreateTopLevelWindow() {
+  nsCOMPtr<nsIWidget> window = new nsWindow();
+  return window.forget();
+}
+
+already_AddRefed<nsIWidget> nsIWidget::CreateChildWindow() {
+  nsCOMPtr<nsIWidget> window = new nsWindow();
+  return window.forget();
+}
+
+static already_AddRefed<DataSourceSurface> GetCursorImage(
+    const nsIWidget::Cursor& aCursor, mozilla::CSSToLayoutDeviceScale aScale) {
+  if (!aCursor.IsCustom()) {
+    return nullptr;
+  }
+
+  RefPtr<DataSourceSurface> destDataSurface;
+
+  nsIntSize size = nsIWidget::CustomCursorSize(aCursor);
+  // prevent DoS attacks
+  if (size.width > 128 || size.height > 128) {
+    return nullptr;
+  }
+
+  RefPtr<gfx::SourceSurface> surface = aCursor.mContainer->GetFrameAtSize(
+      size * aScale.scale, imgIContainer::FRAME_CURRENT,
+      imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY);
+  if (NS_WARN_IF(!surface)) {
+    return nullptr;
+  }
+
+  RefPtr<DataSourceSurface> srcDataSurface = surface->GetDataSurface();
+  if (NS_WARN_IF(!srcDataSurface)) {
+    return nullptr;
+  }
+
+  DataSourceSurface::ScopedMap sourceMap(srcDataSurface,
+                                         DataSourceSurface::READ);
+
+  destDataSurface = gfx::Factory::CreateDataSourceSurfaceWithStride(
+      srcDataSurface->GetSize(), SurfaceFormat::R8G8B8A8,
+      sourceMap.GetStride());
+  if (NS_WARN_IF(!destDataSurface)) {
+    return nullptr;
+  }
+
+  DataSourceSurface::ScopedMap destMap(destDataSurface,
+                                       DataSourceSurface::READ_WRITE);
+
+  SwizzleData(sourceMap.GetData(), sourceMap.GetStride(), surface->GetFormat(),
+              destMap.GetData(), destMap.GetStride(), SurfaceFormat::R8G8B8A8,
+              destDataSurface->GetSize());
+
+  return destDataSurface.forget();
+}
+
+static int32_t GetCursorType(nsCursor aCursor) {
+  // When our minimal requirement of SDK version is 25+,
+  // we should replace with JNI auto-generator.
+  switch (aCursor) {
+    case eCursor_standard:
+      // android.view.PointerIcon.TYPE_ARROW
+      return 0x3e8;
+    case eCursor_wait:
+      // android.view.PointerIcon.TYPE_WAIT
+      return 0x3ec;
+    case eCursor_select:
+      // android.view.PointerIcon.TYPE_TEXT;
+      return 0x3f0;
+    case eCursor_hyperlink:
+      // android.view.PointerIcon.TYPE_HAND
+      return 0x3ea;
+    case eCursor_n_resize:
+    case eCursor_s_resize:
+    case eCursor_ns_resize:
+    case eCursor_row_resize:
+      // android.view.PointerIcon.TYPE_VERTICAL_DOUBLE_ARROW
+      return 0x3f7;
+    case eCursor_w_resize:
+    case eCursor_e_resize:
+    case eCursor_ew_resize:
+    case eCursor_col_resize:
+      // android.view.PointerIcon.TYPE_HORIZONTAL_DOUBLE_ARROW
+      return 0x3f6;
+    case eCursor_nw_resize:
+    case eCursor_se_resize:
+    case eCursor_nwse_resize:
+      // android.view.PointerIcon.TYPE_TOP_LEFT_DIAGONAL_DOUBLE_ARROW
+      return 0x3f9;
+    case eCursor_ne_resize:
+    case eCursor_sw_resize:
+    case eCursor_nesw_resize:
+      // android.view.PointerIcon.TYPE_TOP_RIGHT_DIAGONAL_DOUBLE_ARROW
+      return 0x3f8;
+    case eCursor_crosshair:
+      // android.view.PointerIcon.TYPE_CROSSHAIR
+      return 0x3ef;
+    case eCursor_move:
+      // android.view.PointerIcon.TYPE_ARROW
+      return 0x3e8;
+    case eCursor_help:
+      // android.view.PointerIcon.TYPE_HELP
+      return 0x3eb;
+    case eCursor_copy:
+      // android.view.PointerIcon.TYPE_COPY
+      return 0x3f3;
+    case eCursor_alias:
+      // android.view.PointerIcon.TYPE_ALIAS
+      return 0x3f2;
+    case eCursor_context_menu:
+      // android.view.PointerIcon.TYPE_CONTEXT_MENU
+      return 0x3e9;
+    case eCursor_cell:
+      // android.view.PointerIcon.TYPE_CELL
+      return 0x3ee;
+    case eCursor_grab:
+      // android.view.PointerIcon.TYPE_GRAB
+      return 0x3fc;
+    case eCursor_grabbing:
+      // android.view.PointerIcon.TYPE_GRABBING
+      return 0x3fd;
+    case eCursor_spinning:
+      // android.view.PointerIcon.TYPE_WAIT
+      return 0x3ec;
+    case eCursor_zoom_in:
+      // android.view.PointerIcon.TYPE_ZOOM_IN
+      return 0x3fa;
+    case eCursor_zoom_out:
+      // android.view.PointerIcon.TYPE_ZOOM_OUT
+      return 0x3fb;
+    case eCursor_not_allowed:
+      // android.view.PointerIcon.TYPE_NO_DROP:
+      return 0x3f4;
+    case eCursor_no_drop:
+      // android.view.PointerIcon.TYPE_NO_DROP:
+      return 0x3f4;
+    case eCursor_vertical_text:
+      // android.view.PointerIcon.TYPE_VERTICAL_TEXT
+      return 0x3f1;
+    case eCursor_all_scroll:
+      // android.view.PointerIcon.TYPE_ALL_SCROLL
+      return 0x3f5;
+    case eCursor_none:
+      // android.view.PointerIcon.TYPE_NULL
+      return 0;
+    default:
+      NS_WARNING_ASSERTION(aCursor, "Invalid cursor type");
+      // android.view.PointerIcon.TYPE_ARROW
+      return 0x3e8;
+  }
+}
+
+void nsWindow::SetCursor(const Cursor& aCursor) {
+  if (mozilla::jni::GetAPIVersion() < 24) {
+    return;
+  }
+
+  // Only change cursor if it's actually been changed
+  if (!mUpdateCursor && mCursor == aCursor) {
+    return;
+  }
+
+  mUpdateCursor = false;
+  mCursor = aCursor;
+
+  int32_t type = 0;
+  RefPtr<DataSourceSurface> destDataSurface =
+      GetCursorImage(aCursor, GetDefaultScale());
+  if (!destDataSurface) {
+    type = GetCursorType(aCursor.mDefaultCursor);
+  }
+
+  if (mozilla::jni::NativeWeakPtr<LayerViewSupport>::Accessor lvs{
+          mLayerViewSupport.Access()}) {
+    const auto& compositor = lvs->GetJavaCompositor();
+
+    DispatchToUiThread(
+        "nsWindow::SetCursor",
+        [compositor = GeckoSession::Compositor::GlobalRef(compositor), type,
+         destDataSurface = std::move(destDataSurface),
+         hotspotX = aCursor.mHotspotX, hotspotY = aCursor.mHotspotY] {
+          java::sdk::Bitmap::LocalRef bitmap;
+          if (destDataSurface) {
+            DataSourceSurface::ScopedMap destMap(destDataSurface,
+                                                 DataSourceSurface::READ);
+            auto pixels = mozilla::jni::ByteBuffer::New(
+                reinterpret_cast<int8_t*>(destMap.GetData()),
+                destMap.GetStride() * destDataSurface->GetSize().height);
+            bitmap = java::sdk::Bitmap::CreateBitmap(
+                destDataSurface->GetSize().width,
+                destDataSurface->GetSize().height,
+                java::sdk::Bitmap::Config::ARGB_8888());
+            bitmap->CopyPixelsFromBuffer(pixels);
+          }
+          compositor->SetPointerIcon(type, bitmap, hotspotX, hotspotY);
+        });
+  }
+}