[blink] Request compositing update when canvas hibernates/wakes up.

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 341 matching lines @@
   // content did not change because it layer was destroyed.
   DidDraw();
 }
 
 void HTMLCanvasElement::RestoreCanvasMatrixClipStack(
     PaintCanvas* canvas) const {
   if (context_)
     context_->RestoreCanvasMatrixClipStack(canvas);
 }
 
+void HTMLCanvasElement::SetNeedsCompositingUpdate() {
+  Element::SetNeedsCompositingUpdate();
+}
+
 void HTMLCanvasElement::DoDeferredPaintInvalidation() {
   DCHECK(!dirty_rect_.IsEmpty());
   if (context_->Is2d()) {
     FloatRect src_rect(0, 0, size().Width(), size().Height());
     dirty_rect_.Intersect(src_rect);
     LayoutBox* lb = GetLayoutBox();
     FloatRect invalidation_rect;
     if (lb) {
       FloatRect mapped_dirty_rect =
           MapRect(dirty_rect_, src_rect, FloatRect(lb->ContentBoxRect()));
@@ skipping 1104 matching lines @@
     // Creates a placeholder layer first before Surface is created.
     surface_layer_bridge_->CreateSolidColorLayer();
   }
 }
 
 void HTMLCanvasElement::OnWebLayerReplaced() {
   SetNeedsCompositingUpdate();
 }
 
 }  // namespace blink