WebGL backbuffer creation on Mali-400 GPU

Source/platform/graphics/gpu/DrawingBuffer.h

Index: Source/platform/graphics/gpu/DrawingBuffer.h
diff --git a/Source/platform/graphics/gpu/DrawingBuffer.h b/Source/platform/graphics/gpu/DrawingBuffer.h
index d2531168184b3acb2b53f3d106097debe43f2abf..373a4bfb13e6bbdc34bf471cdee2a8a23c7eaa77 100644
--- a/Source/platform/graphics/gpu/DrawingBuffer.h
+++ b/Source/platform/graphics/gpu/DrawingBuffer.h
@@ -164,6 +164,7 @@ public:
 
     int sampleCount() const { return m_sampleCount; }
     bool explicitResolveOfMultisampleData() const { return m_multisampleMode == ExplicitResolve; };
+    bool isRGBTextureSupported() const { return m_RGBTextureSupported; }
 
 protected: // For unittests
     DrawingBuffer(
@@ -221,7 +222,9 @@ private:
     // Allocate buffer storage to be sent to compositor using either texImage2D or CHROMIUM_image based on available support.
     void allocateTextureMemory(TextureInfo*, const IntSize&);
     void deleteChromiumImageForTexture(TextureInfo*);
+    void validateBackbuffer();

[Ken Russell (switch to Gerrit), 2015/04/06 21:43:18]

Please name this something more obvious like "determineRGBTextureSupport".

 
+    bool m_RGBTextureSupported;
     PreserveDrawingBuffer m_preserveDrawingBuffer;
     bool m_scissorEnabled;
     Platform3DObject m_texture2DBinding;