Make ui::Snapshot asynchronous on Android, remove CompositeAndReadback.

cc/output/copy_output_request.h

 // Copyright 2013 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 CC_OUTPUT_COPY_OUTPUT_REQUEST_H_
 #define CC_OUTPUT_COPY_OUTPUT_REQUEST_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
+#include "cc/resources/single_release_callback.h"
 #include "cc/resources/texture_mailbox.h"
 #include "ui/gfx/rect.h"
 
 class SkBitmap;
 
 namespace cc {
 class CopyOutputResult;
-class SingleReleaseCallback;
 
 class CC_EXPORT CopyOutputRequest {
  public:
   typedef base::Callback<void(scoped_ptr<CopyOutputResult> result)>
       CopyOutputRequestCallback;
 
   static scoped_ptr<CopyOutputRequest> CreateEmptyRequest() {
     return make_scoped_ptr(new CopyOutputRequest);
   }
   static scoped_ptr<CopyOutputRequest> CreateRequest(
@@ skipping 48 matching lines @@
   bool has_area_;
   bool has_texture_mailbox_;
   gfx::Rect area_;
   TextureMailbox texture_mailbox_;
   CopyOutputRequestCallback result_callback_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COPY_OUTPUT_REQUEST_H_