Use GLHelper support to validate format before processing texture.

content/browser/compositor/delegated_frame_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_DELEGATED_FRAME_HOST_H_
 #define CONTENT_BROWSER_COMPOSITOR_DELEGATED_FRAME_HOST_H_
 
 #include "cc/layers/delegated_frame_provider.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
 #include "cc/output/copy_output_result.h"
@@ skipping 192 matching lines @@
   static void CopyFromCompositingSurfaceFinishedForVideo(
       base::WeakPtr<DelegatedFrameHost> rwhva,
       const base::Callback<void(bool)>& callback,
       scoped_refptr<OwnedMailbox> subscriber_texture,
       scoped_ptr<cc::SingleReleaseCallback> release_callback,
       bool result);
   static void ReturnSubscriberTexture(
       base::WeakPtr<DelegatedFrameHost> rwhva,
       scoped_refptr<OwnedMailbox> subscriber_texture,
       uint32 sync_point);
+  static bool IsReadbackConfigSupported(SkColorType color_type);
 
   void SendDelegatedFrameAck(uint32 output_surface_id);
   void SurfaceDrawn(uint32 output_surface_id, bool drawn);
   void SendReturnedDelegatedResources(uint32 output_surface_id);
 
   // DelegatedFrameEvictorClient implementation.
   void EvictDelegatedFrame() override;
 
   // cc::DelegatedFrameProviderClient implementation.
   void UnusedResourcesAreAvailable() override;
@@ skipping 83 matching lines @@
   // YUV readback pipeline.
   scoped_ptr<content::ReadbackYUVInterface>
       yuv_readback_pipeline_;
 
   scoped_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_DELEGATED_FRAME_HOST_H_