Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/ipc/service/gpu_memory_buffer_factory_io_surface.h

Index: gpu/ipc/service/gpu_memory_buffer_factory_io_surface.h
diff --git a/gpu/ipc/service/gpu_memory_buffer_factory_io_surface.h b/gpu/ipc/service/gpu_memory_buffer_factory_io_surface.h
index 73eda154da57840103ded41b1b7121a946cc5bae..7e6dcbb1a8e51237cbc55900252ed6653211833f 100644
--- a/gpu/ipc/service/gpu_memory_buffer_factory_io_surface.h
+++ b/gpu/ipc/service/gpu_memory_buffer_factory_io_surface.h
@@ -53,6 +53,10 @@ class GPU_EXPORT GpuMemoryBufferFactoryIOSurface
       gfx::BufferFormat format,
       unsigned internalformat,
       int client_id) override;
+  scoped_refptr<gl::GLImage> CreateAnonymousImage(
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      unsigned internalformat) override;
 
  private:
   typedef std::pair<gfx::IOSurfaceId, int> IOSurfaceMapKey;