Removed most calls to GraphicsContext3D from DrawingBuffer

Source/platform/graphics/GraphicsContext3D.h

Index: Source/platform/graphics/GraphicsContext3D.h
diff --git a/Source/platform/graphics/GraphicsContext3D.h b/Source/platform/graphics/GraphicsContext3D.h
index 3bd10a10ff18a1ea3cec0b06150cd1f5296a62df..43647278c9d672e9dbcdbccc40ba1bac515562f2 100644
--- a/Source/platform/graphics/GraphicsContext3D.h
+++ b/Source/platform/graphics/GraphicsContext3D.h
@@ -101,21 +101,6 @@ public:
         KURL topDocumentURL;
     };
 
-    class ContextLostCallback {
-    public:
-        virtual void onContextLost() = 0;
-        virtual ~ContextLostCallback() {}
-    };
-
-    class ErrorMessageCallback {
-    public:
-        virtual void onErrorMessage(const String& message, GLint id) = 0;
-        virtual ~ErrorMessageCallback() { }
-    };
-
-    void setContextLostCallback(PassOwnPtr<ContextLostCallback>);
-    void setErrorMessageCallback(PassOwnPtr<ErrorMessageCallback>);
-
     // This is the preferred method for creating an instance of this class. When created this way the webContext
     // is not owned by the GraphicsContext3D
     static PassRefPtr<GraphicsContext3D> createContextSupport(blink::WebGraphicsContext3D* webContext);
@@ -137,8 +122,6 @@ public:
 
     bool makeContextCurrent();
 
-    uint32_t lastFlushID();
-
     // Helper to texImage2D with pixel==0 case: pixels are initialized to 0.
     // Return true if no GL error is synthesized.
     // By default, alignment is 4, the OpenGL default setting.
@@ -403,7 +386,8 @@ public:
     bool supportsExtension(const String& name);
     bool ensureExtensionEnabled(const String& name);
     bool isExtensionEnabled(const String& name);
-    bool canUseCopyTextureCHROMIUM(GLenum destFormat, GLenum destType, GLint level);
+
+    static bool canUseCopyTextureCHROMIUM(GLenum destFormat, GLenum destType, GLint level);
 
     void paintFramebufferToCanvas(int framebuffer, int width, int height, bool premultiplyAlpha, ImageBuffer*);
 
@@ -425,12 +409,8 @@ private:
 
     void initializeExtensions();
 
-    bool preserveDrawingBuffer() const { return m_preserveDrawingBuffer; }
-
     OwnPtr<blink::WebGraphicsContext3DProvider> m_provider;
     blink::WebGraphicsContext3D* m_impl;
-    OwnPtr<GraphicsContext3DContextLostCallbackAdapter> m_contextLostCallbackAdapter;
-    OwnPtr<GraphicsContext3DErrorMessageCallbackAdapter> m_errorMessageCallbackAdapter;
     OwnPtr<blink::WebGraphicsContext3D> m_ownedWebContext;
     bool m_initializedAvailableExtensions;
     HashSet<String> m_enabledExtensions;