Allow layers to signal that additional sequences are needed before surface destruction

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 99 matching lines @@
   bool CanSubscribeFrame() const;
   void BeginFrameSubscription(
       scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber);
   void EndFrameSubscription();
   bool HasFrameSubscriber() const { return frame_subscriber_; }
 
   // Exposed for tests.
   cc::DelegatedFrameProvider* FrameProviderForTesting() const {
     return frame_provider_.get();
   }
+  cc::SurfaceHolder* SurfaceHolderForTesting() const {
+    return surface_holder_.get();
+  }
   cc::SurfaceId SurfaceIdForTesting() const { return surface_id_; }
   void OnCompositingDidCommitForTesting(ui::Compositor* compositor) {
     OnCompositingDidCommit(compositor);
   }
   bool ShouldCreateResizeLockForTesting() { return ShouldCreateResizeLock(); }
   bool ReleasedFrontLockActiveForTesting() const {
     return !!released_front_lock_.get();
   }
 
  private:
@@ skipping 130 matching lines @@
   // renderer.
   scoped_refptr<cc::DelegatedFrameResourceCollection> resource_collection_;
 
   // Provides delegated frame updates to the cc::DelegatedRendererLayer.
   scoped_refptr<cc::DelegatedFrameProvider> frame_provider_;
 
   // State for rendering into a Surface.
   scoped_ptr<cc::SurfaceIdAllocator> id_allocator_;
   scoped_ptr<cc::SurfaceFactory> surface_factory_;
   cc::SurfaceId surface_id_;
+  scoped_refptr<cc::SurfaceHolder> surface_holder_;
   gfx::Size current_surface_size_;
   cc::ReturnedResourceArray surface_returned_resources_;
 
   // This lock is the one waiting for a frame of the right size to come back
   // from the renderer/GPU process. It is set from the moment the aura window
   // got resized, to the moment we committed the renderer frame of the same
   // size. It keeps track of the size we expect from the renderer, and locks the
   // compositor, as well as the UI for a short time to give a chance to the
   // renderer of producing a frame of the right size.
   scoped_ptr<ResizeLock> resize_lock_;
@@ skipping 24 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_