Implement native GMB backbuffers in the GLES2 Command Decoder.

cc/test/test_image_factory.cc

 // Copyright 2014 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.
 
 #include "cc/test/test_image_factory.h"
 
 #include <stddef.h>
 
 #include "base/numerics/safe_conversions.h"
 #include "ui/gl/gl_image_shared_memory.h"
@@ skipping 16 matching lines @@
 
   scoped_refptr<gl::GLImageSharedMemory> image(
       new gl::GLImageSharedMemory(size, internalformat));
   if (!image->Initialize(handle.handle, handle.id, format, handle.offset,
                          base::checked_cast<size_t>(handle.stride)))
     return nullptr;
 
   return image;
 }
 
+scoped_refptr<gl::GLImage> TestImageFactory::CreateAnonymousImage(
+    const gfx::Size& size,
+    gfx::BufferFormat format,
+    unsigned internalformat) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
 }  // namespace cc