Create a new GrGLInterface for each GrContext so callback can be used to set GL-context

webkit/gpu/webgraphicscontext3d_in_process_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 WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_
 #define WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_
 
 #include <list>
 #include <set>
 
@@ skipping 394 matching lines @@
   virtual void deleteTexture(WebGLId);
 
   virtual void setContextLostCallback(
       WebGraphicsContext3D::WebGraphicsContextLostCallback* callback) {}
   virtual WGC3Denum getGraphicsResetStatusARB();
 
   virtual void setSwapBuffersCompleteCallbackCHROMIUM(
       WebGraphicsContext3D::
           WebGraphicsSwapBuffersCompleteCallbackCHROMIUM* callback) {}
 
+ protected:
 #if WEBKIT_USING_SKIA
-  virtual GrGLInterface* grGLInterface();
+  virtual GrGLInterface* onCreateGrGLInterface();
 #endif
 
  private:
   // ANGLE related.
   struct ShaderSourceEntry;
 
   typedef base::hash_map<WebGLId, ShaderSourceEntry*> ShaderSourceMap;
 
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
   void FlipVertically(unsigned char* framebuffer,
@@ skipping 55 matching lines @@
   ShaderSourceMap shader_source_map_;
 
   ShHandle fragment_compiler_;
   ShHandle vertex_compiler_;
 };
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_