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diff --git a/widget/TouchEvents.h b/widget/TouchEvents.h
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+++ b/widget/TouchEvents.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_TouchEvents_h__
+#define mozilla_TouchEvents_h__
+
+#include <stdint.h>
+
+#include "mozilla/dom/Touch.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/RefPtr.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+/******************************************************************************
+ * mozilla::WidgetGestureNotifyEvent
+ *
+ * This event is the first event generated when the user touches
+ * the screen with a finger, and it's meant to decide what kind
+ * of action we'll use for that touch interaction.
+ *
+ * The event is dispatched to the layout and based on what is underneath
+ * the initial contact point it's then decided if we should pan
+ * (finger scrolling) or drag the target element.
+ ******************************************************************************/
+
+class WidgetGestureNotifyEvent : public WidgetGUIEvent {
+ public:
+  virtual WidgetGestureNotifyEvent* AsGestureNotifyEvent() override {
+    return this;
+  }
+
+  WidgetGestureNotifyEvent(bool aIsTrusted, EventMessage aMessage,
+                           nsIWidget* aWidget)
+      : WidgetGUIEvent(aIsTrusted, aMessage, aWidget, eGestureNotifyEventClass),
+        mPanDirection(ePanNone),
+        mDisplayPanFeedback(false) {}
+
+  virtual WidgetEvent* Duplicate() const override {
+    // XXX Looks like this event is handled only in PostHandleEvent() of
+    //     EventStateManager.  Therefore, it might be possible to handle this
+    //     in PreHandleEvent() and not to dispatch as a DOM event into the DOM
+    //     tree like ContentQueryEvent.  Then, this event doesn't need to
+    //     support Duplicate().
+    MOZ_ASSERT(mClass == eGestureNotifyEventClass,
+               "Duplicate() must be overridden by sub class");
+    // Not copying widget, it is a weak reference.
+    WidgetGestureNotifyEvent* result =
+        new WidgetGestureNotifyEvent(false, mMessage, nullptr);
+    result->AssignGestureNotifyEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  typedef int8_t PanDirectionType;
+  enum PanDirection : PanDirectionType {
+    ePanNone,
+    ePanVertical,
+    ePanHorizontal,
+    ePanBoth
+  };
+
+  PanDirection mPanDirection;
+  bool mDisplayPanFeedback;
+
+  void AssignGestureNotifyEventData(const WidgetGestureNotifyEvent& aEvent,
+                                    bool aCopyTargets) {
+    AssignGUIEventData(aEvent, aCopyTargets);
+
+    mPanDirection = aEvent.mPanDirection;
+    mDisplayPanFeedback = aEvent.mDisplayPanFeedback;
+  }
+};
+
+/******************************************************************************
+ * mozilla::WidgetSimpleGestureEvent
+ ******************************************************************************/
+
+class WidgetSimpleGestureEvent : public WidgetMouseEventBase {
+ public:
+  virtual WidgetSimpleGestureEvent* AsSimpleGestureEvent() override {
+    return this;
+  }
+
+  WidgetSimpleGestureEvent(bool aIsTrusted, EventMessage aMessage,
+                           nsIWidget* aWidget)
+      : WidgetMouseEventBase(aIsTrusted, aMessage, aWidget,
+                             eSimpleGestureEventClass),
+        mAllowedDirections(0),
+        mDirection(0),
+        mClickCount(0),
+        mDelta(0.0) {}
+
+  WidgetSimpleGestureEvent(const WidgetSimpleGestureEvent& aOther)
+      : WidgetMouseEventBase(aOther.IsTrusted(), aOther.mMessage,
+                             aOther.mWidget, eSimpleGestureEventClass),
+        mAllowedDirections(aOther.mAllowedDirections),
+        mDirection(aOther.mDirection),
+        mClickCount(0),
+        mDelta(aOther.mDelta) {}
+
+  virtual WidgetEvent* Duplicate() const override {
+    MOZ_ASSERT(mClass == eSimpleGestureEventClass,
+               "Duplicate() must be overridden by sub class");
+    // Not copying widget, it is a weak reference.
+    WidgetSimpleGestureEvent* result =
+        new WidgetSimpleGestureEvent(false, mMessage, nullptr);
+    result->AssignSimpleGestureEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  // See SimpleGestureEvent.webidl for values
+  uint32_t mAllowedDirections;
+  // See SimpleGestureEvent.webidl for values
+  uint32_t mDirection;
+  // The number of taps for tap events
+  uint32_t mClickCount;
+  // Delta for magnify and rotate events
+  double mDelta;
+
+  // XXX Not tested by test_assign_event_data.html
+  void AssignSimpleGestureEventData(const WidgetSimpleGestureEvent& aEvent,
+                                    bool aCopyTargets) {
+    AssignMouseEventBaseData(aEvent, aCopyTargets);
+
+    // mAllowedDirections isn't copied
+    mDirection = aEvent.mDirection;
+    mDelta = aEvent.mDelta;
+    mClickCount = aEvent.mClickCount;
+  }
+};
+
+/******************************************************************************
+ * mozilla::WidgetTouchEvent
+ ******************************************************************************/
+
+class WidgetTouchEvent final : public WidgetInputEvent {
+ public:
+  typedef nsTArray<RefPtr<mozilla::dom::Touch>> TouchArray;
+  typedef AutoTArray<RefPtr<mozilla::dom::Touch>, 10> AutoTouchArray;
+  typedef AutoTouchArray::base_type TouchArrayBase;
+
+  WidgetTouchEvent* AsTouchEvent() override { return this; }
+
+  MOZ_COUNTED_DEFAULT_CTOR(WidgetTouchEvent)
+
+  WidgetTouchEvent(const WidgetTouchEvent& aOther)
+      : WidgetInputEvent(aOther.IsTrusted(), aOther.mMessage, aOther.mWidget,
+                         eTouchEventClass) {
+    MOZ_COUNT_CTOR(WidgetTouchEvent);
+    mModifiers = aOther.mModifiers;
+    mTimeStamp = aOther.mTimeStamp;
+    mTouches.AppendElements(aOther.mTouches);
+    mInputSource = aOther.mInputSource;
+    mButton = aOther.mButton;
+    mButtons = aOther.mButtons;
+    mFlags.mCancelable = mMessage != eTouchCancel;
+    mFlags.mHandledByAPZ = aOther.mFlags.mHandledByAPZ;
+  }
+
+  WidgetTouchEvent(WidgetTouchEvent&& aOther)
+      : WidgetInputEvent(std::move(aOther)) {
+    MOZ_COUNT_CTOR(WidgetTouchEvent);
+    mModifiers = aOther.mModifiers;
+    mTimeStamp = aOther.mTimeStamp;
+    mTouches = std::move(aOther.mTouches);
+    mInputSource = aOther.mInputSource;
+    mButton = aOther.mButton;
+    mButtons = aOther.mButtons;
+    mFlags = aOther.mFlags;
+  }
+
+  WidgetTouchEvent& operator=(WidgetTouchEvent&&) = default;
+
+  WidgetTouchEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget)
+      : WidgetInputEvent(aIsTrusted, aMessage, aWidget, eTouchEventClass) {
+    MOZ_COUNT_CTOR(WidgetTouchEvent);
+    mFlags.mCancelable = mMessage != eTouchCancel;
+  }
+
+  MOZ_COUNTED_DTOR_OVERRIDE(WidgetTouchEvent)
+
+  WidgetEvent* Duplicate() const override {
+    MOZ_ASSERT(mClass == eTouchEventClass,
+               "Duplicate() must be overridden by sub class");
+    // Not copying widget, it is a weak reference.
+    WidgetTouchEvent* result = new WidgetTouchEvent(false, mMessage, nullptr);
+    result->AssignTouchEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  TouchArray mTouches;
+  uint16_t mInputSource = 5;  // MouseEvent_Binding::MOZ_SOURCE_TOUCH
+  int16_t mButton = eNotPressed;
+  int16_t mButtons = 0;
+
+  void AssignTouchEventData(const WidgetTouchEvent& aEvent, bool aCopyTargets) {
+    AssignInputEventData(aEvent, aCopyTargets);
+
+    // Assign*EventData() assume that they're called only new instance.
+    MOZ_ASSERT(mTouches.IsEmpty());
+    mTouches.AppendElements(aEvent.mTouches);
+    mInputSource = aEvent.mInputSource;
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_TouchEvents_h__