Add the UI compositor to the Mac build

content/browser/aura/owned_mailbox.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.
-
-#include "base/memory/ref_counted.h"
-#include "content/browser/aura/image_transport_factory.h"
-#include "gpu/command_buffer/common/mailbox.h"
-
-namespace content {
-
-class GLHelper;
-
-// This class holds a texture id and gpu::Mailbox, and deletes the texture
-// id when the object itself is destroyed. Should only be created if a GLHelper
-// exists on the ImageTransportFactory.
-class OwnedMailbox : public base::RefCounted<OwnedMailbox>,
-                     public ImageTransportFactoryObserver {
- public:
-  explicit OwnedMailbox(GLHelper* gl_helper);
-
-  uint32 texture_id() const { return texture_id_; }
-  uint32 sync_point() const { return sync_point_; }
-  const gpu::Mailbox& mailbox() const { return mailbox_; }
-
-  void UpdateSyncPoint(uint32 sync_point);
-  void Destroy();
-
- protected:
-  virtual ~OwnedMailbox();
-
-  // ImageTransportFactoryObserver implementation.
-  virtual void OnLostResources() OVERRIDE;
-
- private:
-  friend class base::RefCounted<OwnedMailbox>;
-
-  uint32 texture_id_;
-  gpu::Mailbox mailbox_;
-  uint32 sync_point_;
-  GLHelper* gl_helper_;
-};
-
-}  // namespace content