Disable force compositing mode when disabling compositing, re-enter in DoDeferredUpdate

content/renderer/render_widget.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 285 matching lines @@
   virtual void DidInitiatePaint() {}
   virtual void DidFlushPaint() {}
 
   // Override and return true when the widget is rendered with a graphics
   // context that supports asynchronous swapbuffers. When returning true, the
   // subclass must call OnSwapBuffersPosted() when swap is posted,
   // OnSwapBuffersComplete() when swaps complete, and OnSwapBuffersAborted if
   // the context is lost.
   virtual bool SupportsAsynchronousSwapBuffers();
 
+  virtual bool ForceCompositingModeEnabled();
+
   // Notifies scheduler that the RenderWidget's subclass has finished or aborted
   // a swap buffers.
   void OnSwapBuffersPosted();
   void OnSwapBuffersComplete();
   void OnSwapBuffersAborted();
 
   // Detects if a suitable opaque plugin covers the given paint bounds with no
   // compositing necessary.
   //
   // Returns the plugin instance that's the source of the paint if the paint
@@ skipping 289 matching lines @@
   typedef std::map<int, SmoothScrollCompletionCallback>
       PendingSmoothScrollGestureMap;
   PendingSmoothScrollGestureMap pending_smooth_scroll_gestures_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_