Allow creating GLImage-backed textures with glTexStorage2D.

gpu/command_buffer/service/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 "gpu/command_buffer/service/image_factory.h"
 
 #include "ui/gl/gl_image.h"
 
 namespace gpu {
 
 ImageFactory::ImageFactory() {
 }
 
 ImageFactory::~ImageFactory() {
 }
 
 scoped_refptr<gl::GLImage> ImageFactory::CreateAnonymousImage(
     const gfx::Size& size,
     gfx::BufferFormat format,
+    gfx::BufferUsage usage,
     unsigned internalformat) {
   NOTREACHED();
   return nullptr;
 }
 
 unsigned ImageFactory::RequiredTextureType() {
   NOTIMPLEMENTED();
   return 0;
 }
 
 bool ImageFactory::SupportsFormatRGB() {
   return true;
 }
 
 }  // namespace gpu