cc/blimp: Add a LayerTreeHostRemote implementation.

cc/blimp/compositor_proto_state_sink.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_H_
+#define CC_BLIMP_COMPOSITOR_PROTO_STATE_SINK_H_
+
+#include "base/macros.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+class CompositorProtoState;
+class CompositorProtoStateSinkClient;
+
+class CC_EXPORT CompositorProtoStateSink {
+ public:
+  virtual ~CompositorProtoStateSink() {}
+
+  // Must be called exactly once before the CompositorProtoStateSink can be
+  // used. Once bound, the client is expected to outlive this class.
+  virtual void BindToClient(CompositorProtoStateSinkClient* client) = 0;
+
+  // Notifies the sink that a main frame update is required.
+  virtual void ScheduleMainFrame() = 0;
+
+  // If a main frame update results in any mutations to the compositor state,
+  // the serialized compositor state is provided to the
+  // CompositorProtoStateSink.
+  virtual void ProcessCompositorStateUpdate(
+      std::unique_ptr<CompositorProtoState> compositor_proto_state) = 0;
+};
+
+}  // namespace cc
+#endif  // CC_BLIMP_COMPOSITOR_PROTO_STATE_SINK_H_