Expose mapExternalTexture extension to WebGraphicsContext3D

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h

Index: webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
index 6330a348d899dd4ace1d011b74c86e331b2c6cf3..5de62987a08a5b5d0739a230310186314e43c3eb 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
+++ b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
@@ -405,6 +405,9 @@ class WebGraphicsContext3DInProcessCommandBufferImpl
 
   virtual void copyTextureToParentTextureCHROMIUM(
       WebGLId texture, WebGLId parentTexture);
+  virtual void mapExternalTextureCHROMIUM(
+      WebGLId source_texture, WebGraphicsContext3D* source_context,
+      WebGLId destination_texture);
 
   virtual void rateLimitOffscreenContextCHROMIUM();
 
@@ -428,6 +431,8 @@ class WebGraphicsContext3DInProcessCommandBufferImpl
       WebGraphicsContext3D::WebGraphicsContextLostCallback* callback);
   virtual WGC3Denum getGraphicsResetStatusARB();
 
+  GLInProcessContext* context() const { return context_; }
+
  private:
   // SwapBuffers callback.
   void OnSwapBuffersComplete();