aura: Clean up compositor initialization/destruction.

content/common/gpu/client/gl_helper.h

 // Copyright (c) 2012 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_COMMON_GPU_CLIENT_GL_HELPER_H_
 #define CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_
 
 #include "base/atomicops.h"
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ skipping 365 matching lines @@
 // a new readback pipeline.
 class CONTENT_EXPORT ReadbackYUVInterface {
 public:
   ReadbackYUVInterface() {}
   virtual ~ReadbackYUVInterface() {}
 
   // Note that |target| must use YV12 format.
   virtual void ReadbackYUV(
       const gpu::Mailbox& mailbox,
       uint32 sync_point,
-      media::VideoFrame* target,
+      const scoped_refptr<media::VideoFrame>& target,
       const base::Callback<void(bool)>& callback) = 0;
   virtual GLHelper::ScalerInterface* scaler() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_