Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/command_buffer/tests/texture_image_factory.h

+// Copyright 2016 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"
+
+namespace gpu {
+
+// The images created by this factory have no inherent storage. When the image
+// is bound to a texture, storage is allocated for the texture via glTexImage2D.
+class TextureImageFactory : public gpu::ImageFactory {
+ public:
+  scoped_refptr<gl::GLImage> CreateImageForGpuMemoryBuffer(
+      const gfx::GpuMemoryBufferHandle& handle,
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      unsigned internalformat,
+      int client_id) override;
+  scoped_refptr<gl::GLImage> CreateAnonymousImage(
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      unsigned internalformat) override;
+  unsigned RequiredTextureType() override;
+  bool SupportsFormatRGB() override;
+
+  void SetRequiredTextureType(unsigned type);
+
+ private:
+  unsigned required_texture_type_ = 0;
+};
+
+}  // namespace gpu