Fixing laggy chrome on a multitude of accelerated canvases

third_party/WebKit/Source/platform/graphics/ImageBuffer.h

Index: third_party/WebKit/Source/platform/graphics/ImageBuffer.h
diff --git a/third_party/WebKit/Source/platform/graphics/ImageBuffer.h b/third_party/WebKit/Source/platform/graphics/ImageBuffer.h
index 1fd37ba6f4f2b64307a8a04923c9f9ad3dfce337..59f248a7d834305da58e5a2559bbeaa237c5777f 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageBuffer.h
+++ b/third_party/WebKit/Source/platform/graphics/ImageBuffer.h
@@ -135,6 +135,10 @@ public:
 
     void draw(GraphicsContext*, const FloatRect&, const FloatRect*, SkXfermode::Mode);
 
+    void updateGPUMemoryUsage() const;
+    static intptr_t getTotalGPUMemoryUsage() { return s_totalGPUMemoryUsage; }

[Justin Novosad, 2015/12/08 22:15:27]

Total -> Global

+    intptr_t getGPUMemoryUsage() { return m_gpuMemoryUsage; }
+
 private:
     ImageBuffer(PassOwnPtr<ImageBufferSurface>);
 
@@ -146,6 +150,9 @@ private:
     mutable SnapshotState m_snapshotState;
     OwnPtr<ImageBufferSurface> m_surface;
     ImageBufferClient* m_client;
+
+    mutable intptr_t m_gpuMemoryUsage;
+    static intptr_t s_totalGPUMemoryUsage;
 };
 
 struct ImageDataBuffer {