Extract non-Mojo bits of GpuCompositorFrameSink to CompositorFrameSinkSupport

cc/surfaces/compositor_frame_sink_support_client.h

+// Copyright 2016 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_SURFACES_COMPOSITOR_FRAME_SINK_SUPPORT_CLIENT_H_
+#define CC_SURFACES_COMPOSITOR_FRAME_SINK_SUPPORT_CLIENT_H_
+
+#include "cc/resources/returned_resource.h"
+
+namespace cc {
+
+struct BeginFrameArgs;
+
+class CompositorFrameSinkSupportClient {
+ public:
+  // Notification that the previous CompositorFrame given to
+  // SubmitCompositorFrame() has been processed and that another frame
+  // can be submitted. This provides backpressure from the display compositor
+  // so that frames are submitted only at the rate it can handle them.
+  // TODO(fsamuel): This method ought not be necessary with unified BeginFrame.
+  // However, there's a fair amount of cleanup and refactoring necessary to get
+  // rid of it.
+  virtual void DidReceiveCompositorFrameAck() = 0;
+
+  // Notification for the client to generate a CompositorFrame.
+  virtual void OnBeginFrame(const BeginFrameArgs& args) = 0;
+
+  // Returns resources sent to SubmitCompositorFrame to be reused or freed.
+  virtual void ReclaimResources(const ReturnedResourceArray& resources) = 0;
+
+  // Called when surface is being scheduled for a draw.
+  virtual void WillDrawSurface() = 0;
+
+ protected:
+  virtual ~CompositorFrameSinkSupportClient() {}
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_COMPOSITOR_FRAME_SINK_SUPPORT_CLIENT_H_