Android: Attach hidden layer for CopyFromCompositingSurface()

content/browser/renderer_host/compositor_impl_android.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_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 98 matching lines @@
   void DidCommit() override;
   void DidCommitAndDrawFrame() override {}
   void DidCompleteSwapBuffers() override;
   void DidCompletePageScaleAnimation() override {}
 
   // LayerTreeHostSingleThreadClient implementation.
   void DidPostSwapBuffers() override;
   void DidAbortSwapBuffers() override;
 
   // WindowAndroidCompositor implementation.
+  void AttachLayerForReadback(scoped_refptr<cc::Layer> layer) override;
   void RequestCopyOfOutputOnRootLayer(
       std::unique_ptr<cc::CopyOutputRequest> request) override;
   void OnVSync(base::TimeTicks frame_time,
                base::TimeDelta vsync_period) override;
   void SetNeedsAnimate() override;
   void SetVisible(bool visible);
   void CreateOutputSurface();
   void CreateLayerTreeHost();
 
   void OnGpuChannelEstablished();
@@ skipping 43 matching lines @@
   gpu::Capabilities gpu_capabilities_;
   bool needs_begin_frames_;
   base::WeakPtrFactory<CompositorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorImpl);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_