Turn off computation of the interest rect in cc in synchronized paint mode.

third_party/WebKit/Source/web/LinkHighlightImpl.h

 /*
  * Copyright (C) 2012 Google Inc. 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 42 matching lines @@
 public:
     static PassOwnPtr<LinkHighlightImpl> create(Node*, WebViewImpl*);
     ~LinkHighlightImpl() override;
 
     WebContentLayer* contentLayer();
     WebLayer* clipLayer();
     void startHighlightAnimationIfNeeded();
     void updateGeometry();
 
     // WebContentLayerClient implementation.
+    gfx::Rect paintableRegion() override;
     void paintContents(WebDisplayItemList*, const WebRect& clipRect, WebContentLayerClient::PaintingControlSetting) override;
 
     // WebCompositorAnimationDelegate implementation.
     void notifyAnimationStarted(double monotonicTime, int group) override;
     void notifyAnimationFinished(double monotonicTime, int group) override;
 
     // LinkHighlight implementation.
     void invalidate() override;
     WebLayer* layer() override;
     void clearCurrentGraphicsLayer() override;
@@ skipping 25 matching lines @@
     OwnPtr<WebCompositorAnimationPlayer> m_compositorPlayer;
 
     bool m_geometryNeedsUpdate;
     bool m_isAnimating;
     double m_startTime;
 };
 
 } // namespace blink
 
 #endif // LinkHighlightImpl_h