cc/blimp: Add a LayerTreeHostRemote implementation.

cc/blimp/compositor_proto_state_sink_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_BLIMP_COMPOSITOR_PROTO_STATE_SINK_CLIENT_H_
+#define CC_BLIMP_COMPOSITOR_PROTO_STATE_SINK_CLIENT_H_
+
+#include "base/macros.h"
+#include "cc/base/cc_export.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace cc {
+class CompositorProtoState;
+
+class CC_EXPORT CompositorProtoStateSinkClient {
+ public:
+  virtual ~CompositorProtoStateSinkClient() {}
+
+  // Called in response to a ScheduleMainFrame request made on the
+  // CompositorProtoStateSink.
+  // Note: The method should always be invoked asynchronously after the request
+  // is made.
+  virtual void BeginMainFrame() = 0;
+
+  // Returns the task runner for the compositor's main thread.
+  virtual base::SingleThreadTaskRunner* GetMainTaskRunner() = 0;
+};
+
+}  // namespace cc
+
+#endif  // CC_BLIMP_COMPOSITOR_PROTO_STATE_SINK_CLIENT_H_