Allow each WGC3D subclass to determine the correct GrGLInterface for its GrContext.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
@@ skipping 412 matching lines @@
   RendererGLContext* context() { return context_; }
 
   virtual void setContextLostCallback(
       WebGraphicsContext3D::WebGraphicsContextLostCallback* callback);
   virtual WGC3Denum getGraphicsResetStatusARB();
 
   virtual void setSwapBuffersCompleteCallbackCHROMIUM(
       WebGraphicsContext3D::
           WebGraphicsSwapBuffersCompleteCallbackCHROMIUM* callback);
 
+#if WEBKIT_USING_SKIA
+  virtual GrGLInterface* grGLInterface();
+#endif
+
  private:
   // SwapBuffers callback.
   void OnSwapBuffersComplete();
   virtual void OnContextLost(RendererGLContext::ContextLostReason reason);
 
   // The context we use for OpenGL rendering.
   RendererGLContext* context_;
   // The GLES2Implementation we use for OpenGL rendering.
   gpu::gles2::GLES2Implementation* gl_;
 
@@ skipping 24 matching lines @@
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
   scoped_array<uint8> scanline_;
   void FlipVertically(uint8* framebuffer,
                       unsigned int width,
                       unsigned int height);
 #endif
 };
 
 #endif  // defined(ENABLE_GPU)
 #endif  // CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_