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diff --git a/view/nsViewManager.h b/view/nsViewManager.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 nsViewManager_h___
+#define nsViewManager_h___
+
+#include "nscore.h"
+#include "nsView.h"
+#include "nsCOMPtr.h"
+#include "nsCRT.h"
+#include "nsTArray.h"
+#include "nsDeviceContext.h"
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/EventForwards.h"
+
+class nsIWidget;
+struct nsRect;
+class nsRegion;
+class nsDeviceContext;
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+class nsViewManager final {
+  ~nsViewManager();
+
+ public:
+  friend class nsView;
+
+  typedef mozilla::LayoutDeviceIntRect LayoutDeviceIntRect;
+  typedef mozilla::LayoutDeviceIntRegion LayoutDeviceIntRegion;
+
+  NS_INLINE_DECL_REFCOUNTING(nsViewManager)
+
+  nsViewManager();
+
+  /**
+   * Initialize the ViewManager
+   * Note: this instance does not hold a reference to the presshell
+   * because it holds a reference to this instance.
+   * @result The result of the initialization, NS_OK if no errors
+   */
+  nsresult Init(nsDeviceContext* aContext);
+
+  /**
+   * Create an ordinary view
+   * @param aBounds initial bounds for view
+   *        XXX We should eliminate this parameter; you can set the bounds
+   *        after CreateView
+   * @param aParent intended parent for view. this is not actually set in the
+   *        nsView through this method. it is only used by the initialization
+   *        code to walk up the view tree, if necessary, to find resources.
+   *        XXX We should eliminate this parameter!
+   * @param aVisibilityFlag initial visibility state of view
+   *        XXX We should eliminate this parameter; you can set it after
+   *        CreateView
+   * @result The new view.  Never null.
+   */
+  nsView* CreateView(const nsRect& aBounds, nsView* aParent,
+                     ViewVisibility aVisibilityFlag = ViewVisibility::Show);
+
+  /**
+   * Get the root of the view tree.
+   * @result the root view
+   */
+  nsView* GetRootView() { return mRootView; }
+
+  /**
+   * Set the root of the view tree. Does not destroy the current root view.
+   * aView may have a parent view managed by a different view manager.
+   * aView may have a widget (anything but printing) or may not (printing).
+   * @param aView view to set as root
+   */
+  void SetRootView(nsView* aView);
+
+  /**
+   * Get the dimensions of the root window. The dimensions are in
+   * twips
+   * @param aWidth out parameter for width of window in twips
+   * @param aHeight out parameter for height of window in twips
+   */
+  void GetWindowDimensions(nscoord* aWidth, nscoord* aHeight);
+
+  /**
+   * Set the dimensions of the root window.
+   * Called if the root window is resized. The dimensions are in
+   * twips
+   * @param aWidth of window in twips
+   * @param aHeight of window in twips
+   */
+  void SetWindowDimensions(nscoord aWidth, nscoord aHeight,
+                           bool aDelayResize = false);
+
+  /**
+   * Do any resizes that are pending.
+   */
+  void FlushDelayedResize();
+
+  /**
+   * Called to inform the view manager that the entire area of a view
+   * is dirty and needs to be redrawn.
+   * @param aView view to paint. should be root view
+   */
+  void InvalidateView(nsView* aView);
+
+  /**
+   * Called to inform the view manager that some portion of a view is dirty and
+   * needs to be redrawn. The rect passed in should be in the view's coordinate
+   * space. Does not check for paint suppression.
+   * @param aView view to paint. should be root view
+   * @param rect rect to mark as damaged
+   */
+  void InvalidateViewNoSuppression(nsView* aView, const nsRect& aRect);
+
+  /**
+   * Called to inform the view manager that it should invalidate all views.
+   */
+  void InvalidateAllViews();
+
+  /**
+   * Called to dispatch an event to the appropriate view. Often called
+   * as a result of receiving a mouse or keyboard event from the widget
+   * event system.
+   * @param aEvent event to dispatch
+   * @param aViewTarget dispatch the event to this view
+   * @param aStatus event handling status
+   */
+  MOZ_CAN_RUN_SCRIPT
+  void DispatchEvent(mozilla::WidgetGUIEvent* aEvent, nsView* aViewTarget,
+                     nsEventStatus* aStatus);
+
+  /**
+   * Given a parent view, insert another view as its child.
+   * aSibling and aAbove control the "document order" for the insertion.
+   * If aSibling is null, the view is inserted at the end of the document order
+   * if aAfter is true, otherwise it is inserted at the beginning.
+   * If aSibling is non-null, then if aAfter is true, the view is inserted
+   * after the sibling in document order (appearing above the sibling unless
+   * overriden by z-order).
+   * If it is false, the view is inserted before the sibling.
+   * The view manager generates the appopriate dirty regions.
+   * @param aParent parent view
+   * @param aChild child view
+   * @param aSibling sibling view
+   * @param aAfter after or before in the document order
+   */
+  void InsertChild(nsView* aParent, nsView* aChild, nsView* aSibling,
+                   bool aAfter);
+
+  /**
+   * Remove a specific child view from its parent. This will NOT remove its
+   * placeholder if there is one. The view manager generates the appropriate
+   * dirty regions.
+   * @param aParent parent view
+   * @param aChild child view
+   */
+  void RemoveChild(nsView* aChild);
+
+  /**
+   * Move a view to the specified position, provided in parent coordinates.
+   * The new position is the (0, 0) origin for the view's coordinate system.
+   * The view's bounds may extend above or to the left of this point.
+   * The view manager generates the appropriate dirty regions.
+   * @param aView view to move
+   * @param aX x value for new view position
+   * @param aY y value for new view position
+   */
+  void MoveViewTo(nsView* aView, nscoord aX, nscoord aY);
+
+  /**
+   * Resize a view. In addition to setting the width and height, you can
+   * set the x and y of its bounds relative to its position. Negative x and y
+   * will let the view extend above and to the left of the (0,0) point in its
+   * coordinate system.
+   * The view manager generates the appropriate dirty regions.
+   * @param aView view to move
+   * @param the new bounds relative to the current position
+   * @param RepaintExposedAreaOnly
+   *     if true Repaint only the expanded or contracted region,
+   *     if false Repaint the union of the old and new rectangles.
+   */
+  void ResizeView(nsView* aView, const nsRect& aRect,
+                  bool aRepaintExposedAreaOnly = false);
+
+  /**
+   * Set the visibility of a view. Hidden views have the effect of hiding
+   * their descendants as well. This does not affect painting, so layout
+   * is responsible for ensuring that content in hidden views is not
+   * painted nor handling events. It does affect the visibility of widgets;
+   * if a view is hidden, descendant views with widgets have their widgets
+   * hidden.
+   * The view manager generates the appropriate dirty regions.
+   * @param aView view to change visibility state of
+   * @param visible new visibility state
+   */
+  void SetViewVisibility(nsView* aView, ViewVisibility aVisible);
+
+  /**
+   * Set the z-index of a view. Positive z-indices mean that a view
+   * is above its parent in z-order. Negative z-indices mean that a
+   * view is below its parent.
+   * The view manager generates the appropriate dirty regions.
+   * @param aAutoZIndex indicate that the z-index of a view is "auto". An
+   *     "auto" z-index means that the view does not define a new stacking
+   *     context, which means that the z-indicies of the view's children are
+   *     relative to the view's siblings.
+   * @param aView view to change z depth of
+   * @param aZindex explicit z depth
+   */
+  void SetViewZIndex(nsView* aView, bool aAutoZIndex, int32_t aZindex);
+
+  /**
+   * Set whether the view "floats" above all other views,
+   * which tells the compositor not to consider higher views in
+   * the view hierarchy that would geometrically intersect with
+   * this view. This is a hack, but it fixes some problems with
+   * views that need to be drawn in front of all other views.
+   */
+  void SetViewFloating(nsView* aView, bool aFloatingView);
+
+  /**
+   * Set the presshell associated with this manager
+   * @param aPresShell - new presshell
+   */
+  void SetPresShell(mozilla::PresShell* aPresShell) { mPresShell = aPresShell; }
+
+  /**
+   * Get the pres shell associated with this manager
+   */
+  mozilla::PresShell* GetPresShell() const { return mPresShell; }
+
+  /**
+   * Get the device context associated with this manager
+   */
+  nsDeviceContext* GetDeviceContext() const { return mContext; }
+
+  /**
+   * A stack class for disallowing changes that would enter painting. For
+   * example, popup widgets shouldn't be resized during reflow, since doing so
+   * might cause synchronous painting inside reflow which is forbidden.
+   * While refresh is disabled, widget geometry changes are deferred and will
+   * be handled later, either from the refresh driver or from an NS_WILL_PAINT
+   * event.
+   * We don't want to defer widget geometry changes all the time. Resizing a
+   * popup from script doesn't need to be deferred, for example, especially
+   * since popup widget geometry is observable from script and expected to
+   * update synchronously.
+   */
+  class MOZ_STACK_CLASS AutoDisableRefresh {
+   public:
+    explicit AutoDisableRefresh(nsViewManager* aVM) {
+      if (aVM) {
+        mRootVM = aVM->IncrementDisableRefreshCount();
+      }
+    }
+    ~AutoDisableRefresh() {
+      if (mRootVM) {
+        mRootVM->DecrementDisableRefreshCount();
+      }
+    }
+
+   private:
+    AutoDisableRefresh(const AutoDisableRefresh& aOther);
+    const AutoDisableRefresh& operator=(const AutoDisableRefresh& aOther);
+
+    RefPtr<nsViewManager> mRootVM;
+  };
+
+ private:
+  friend class AutoDisableRefresh;
+
+  nsViewManager* IncrementDisableRefreshCount();
+  void DecrementDisableRefreshCount();
+
+ public:
+  /**
+   * Retrieve the widget at the root of the nearest enclosing
+   * view manager whose root view has a widget.
+   */
+  nsIWidget* GetRootWidget() const;
+
+  /**
+   * Indicate whether the viewmanager is currently painting
+   *
+   * @param aPainting true if the viewmanager is painting
+   *                  false otherwise
+   */
+  void IsPainting(bool& aIsPainting);
+
+  /**
+   * Retrieve the time of the last user event. User events
+   * include mouse and keyboard events. The viewmanager
+   * saves the time of the last user event.
+   *
+   * @param aTime Last user event time in microseconds
+   */
+  void GetLastUserEventTime(uint32_t& aTime);
+
+  /**
+   * Find the nearest display root view for the view aView. This is the view for
+   * the nearest enclosing popup or the root view for the root document.
+   */
+  static nsView* GetDisplayRootFor(nsView* aView);
+
+  /**
+   * Flush the accumulated dirty region to the widget and update widget
+   * geometry.
+   */
+  MOZ_CAN_RUN_SCRIPT void ProcessPendingUpdates();
+
+  /**
+   * Just update widget geometry without flushing the dirty region
+   */
+  MOZ_CAN_RUN_SCRIPT void UpdateWidgetGeometry();
+
+  int32_t AppUnitsPerDevPixel() const {
+    return mContext->AppUnitsPerDevPixel();
+  }
+
+ private:
+  static uint32_t gLastUserEventTime;
+
+  /* Update the cached RootViewManager pointer on this view manager. */
+  void InvalidateHierarchy();
+  void FlushPendingInvalidates();
+
+  MOZ_CAN_RUN_SCRIPT
+  void ProcessPendingUpdatesForView(nsView* aView,
+                                    bool aFlushDirtyRegion = true);
+  void ProcessPendingUpdatesRecurse(
+      nsView* aView, AutoTArray<nsCOMPtr<nsIWidget>, 1>& aWidgets);
+  MOZ_CAN_RUN_SCRIPT
+  void ProcessPendingUpdatesPaint(nsIWidget* aWidget);
+
+  void FlushDirtyRegionToWidget(nsView* aView);
+  /**
+   * Call WillPaint() on all view observers under this vm root.
+   */
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void CallWillPaintOnObservers();
+  static void CollectVMsForWillPaint(nsView* aView, nsViewManager* aParentVM,
+                                     nsTArray<RefPtr<nsViewManager>>& aVMs);
+
+  void ReparentChildWidgets(nsView* aView, nsIWidget* aNewWidget);
+  void ReparentWidgets(nsView* aView, nsView* aParent);
+  void InvalidateWidgetArea(nsView* aWidgetView,
+                            const nsRegion& aDamagedRegion);
+
+  void InvalidateViews(nsView* aView);
+
+  // aView is the view for aWidget and aRegion is relative to aWidget.
+  MOZ_CAN_RUN_SCRIPT
+  void Refresh(nsView* aView, const LayoutDeviceIntRegion& aRegion);
+
+  // Utilities
+
+  bool IsViewInserted(nsView* aView);
+
+  /**
+   * Intersects aRect with aView's bounds and then transforms it from aView's
+   * coordinate system to the coordinate system of the widget attached to
+   * aView.
+   */
+  LayoutDeviceIntRect ViewToWidget(nsView* aView, const nsRect& aRect) const;
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void DoSetWindowDimensions(nscoord aWidth, nscoord aHeight);
+  bool ShouldDelayResize() const;
+
+  bool IsPainting() const { return RootViewManager()->mPainting; }
+
+  void SetPainting(bool aPainting) { RootViewManager()->mPainting = aPainting; }
+
+  void InvalidateView(nsView* aView, const nsRect& aRect);
+
+  nsViewManager* RootViewManager() const {
+    return mRootViewManager ? mRootViewManager.get()
+                            : const_cast<nsViewManager*>(this);
+  }
+  bool IsRootVM() const { return !mRootViewManager; }
+
+  // Whether synchronous painting is allowed at the moment. For example,
+  // widget geometry changes can cause synchronous painting, so they need to
+  // be deferred while refresh is disabled.
+  bool IsPaintingAllowed() {
+    return RootViewManager()->mRefreshDisableCount == 0;
+  }
+
+  MOZ_CAN_RUN_SCRIPT void WillPaintWindow(nsIWidget* aWidget);
+  MOZ_CAN_RUN_SCRIPT
+  bool PaintWindow(nsIWidget* aWidget, const LayoutDeviceIntRegion& aRegion);
+  MOZ_CAN_RUN_SCRIPT void DidPaintWindow();
+
+  // Call this when you need to let the viewmanager know that it now has
+  // pending updates.
+  void PostPendingUpdate();
+
+  RefPtr<nsDeviceContext> mContext;
+  mozilla::PresShell* mPresShell;
+
+  // The size for a resize that we delayed until the root view becomes
+  // visible again.
+  nsSize mDelayedResize;
+
+  nsView* mRootView;
+
+  // mRootViewManager is a strong reference to the root view manager, unless
+  // |this| is the root, in which case mRootViewManager is null.  Callers
+  // should use RootViewManager() (which handles that case) rather than using
+  // mRootViewManager directly.
+  RefPtr<nsViewManager> mRootViewManager;
+
+  // The following members should not be accessed directly except by
+  // the root view manager.  Some have accessor functions to enforce
+  // this, as noted.
+
+  int32_t mRefreshDisableCount;
+  // Use IsPainting() and SetPainting() to access mPainting.
+  bool mPainting;
+  bool mRecursiveRefreshPending;
+  bool mHasPendingWidgetGeometryChanges;
+
+  // from here to public should be static and locked... MMP
+};
+
+/**
+   Invalidation model:
+
+   1) Callers call into the view manager and ask it to invalidate a view.
+
+   2) The view manager finds the "right" widget for the view, henceforth called
+      the root widget.
+
+   3) The view manager traverses descendants of the root widget and for each
+      one that needs invalidation stores the rect to invalidate on the widget's
+      view (batching).
+
+   4) The dirty region is flushed to the right widget when
+      ProcessPendingUpdates is called from the RefreshDriver.
+
+   It's important to note that widgets associated to views outside this view
+   manager can end up being invalidated during step 3.  Therefore, the end of a
+   view update batch really needs to traverse the entire view tree, to ensure
+   that those invalidates happen.
+
+   To cope with this, invalidation processing and should only happen on the
+   root viewmanager.
+*/
+
+#endif  // nsViewManager_h___