content/blimp: Set up hooks for enabling LTHRemote in the renderer.

blimp/engine/renderer/blimp_remote_compositor_bridge.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 BLIMP_ENGINE_RENDERER_BLIMP_REMOTE_COMPOSITOR_BRIDGE_H_
+#define BLIMP_ENGINE_RENDERER_BLIMP_REMOTE_COMPOSITOR_BRIDGE_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "blimp/engine/renderer/frame_scheduler.h"
+#include "cc/blimp/remote_compositor_bridge.h"
+#include "cc/trees/remote_proto_channel.h"
+
+namespace blimp {
+namespace engine {
+
+class BlimpRemoteCompositorBridge
+    : public cc::RemoteCompositorBridge,
+      public cc::RemoteProtoChannel::ProtoReceiver,
+      public FrameSchedulerClient {
+ public:
+  // TODO(khushalsagar): Stop using the RemoteProtoChannel. See
+  // crbug.com/653697.
+  // |remote_proto_channel| should outlive the BlimpRemoteCompositorBridge.
+  BlimpRemoteCompositorBridge(
+      cc::RemoteProtoChannel* remote_proto_channel,
+      scoped_refptr<base::SingleThreadTaskRunner> compositor_main_task_runner);
+  ~BlimpRemoteCompositorBridge() override;
+
+  // cc::RemoteCompositorBridge implementation.
+  void BindToClient(cc::RemoteCompositorBridgeClient* client) override;
+  void ScheduleMainFrame() override;
+  void ProcessCompositorStateUpdate(std::unique_ptr<cc::CompositorProtoState>
+                                        compositor_proto_state) override;
+
+ private:
+  // cc::RemoteProtoChannel::ProtoReceiver implementation.
+  void OnProtoReceived(
+      std::unique_ptr<cc::proto::CompositorMessage> proto) override;
+
+  // FrameSchedulerClient implementation.
+  void StartFrameUpdate() override;
+
+  cc::RemoteProtoChannel* remote_proto_channel_;
+  cc::RemoteCompositorBridgeClient* client_ = nullptr;
+
+  FrameScheduler scheduler_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpRemoteCompositorBridge);
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_RENDERER_BLIMP_REMOTE_COMPOSITOR_BRIDGE_H_