Stop unnecessary flushing in Canvas2DLayerBridge

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.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 248 matching lines @@
   bool m_destructionInProgress;
   SkFilterQuality m_filterQuality;
   bool m_isHidden;
   bool m_isDeferralEnabled;
   bool m_isRegisteredTaskObserver;
   bool m_renderingTaskCompletedForCurrentFrame;
   bool m_softwareRenderingWhileHidden;
   bool m_surfaceCreationFailedAtLeastOnce = false;
   bool m_hibernationScheduled = false;
   bool m_dontUseIdleSchedulingForTesting = false;
+  bool m_didDrawSinceLastFlush = false;
+  bool m_didDrawSinceLastGpuFlush = false;
 
   friend class Canvas2DLayerBridgeTest;
   friend class CanvasRenderingContext2DTest;
   friend class HTMLCanvasPainterTestForSPv2;
 
   uint32_t m_lastImageId;
 
   enum {
     // We should normally not have more that two active mailboxes at a time,
     // but sometimes we may have three due to the async nature of mailbox
@@ skipping 14 matching lines @@
   // Each element in this vector represents an IOSurface backed texture that
   // is ready to be reused.
   // Elements in this vector can safely be purged in low memory conditions.
   Vector<RefPtr<ImageInfo>> m_imageInfoCache;
 #endif  // USE_IOSURFACE_FOR_2D_CANVAS
 };
 
 }  // namespace blink
 
 #endif