cc:: Add remote mode to the compositor

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index f7bd43368c3abde927cf59c358cf6ea2273b141b..977d38bccfb6ca2c2eb967a20b73eba79afe575a 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -61,6 +61,7 @@ class LayerTreeHostImplClient;
 class LayerTreeHostSingleThreadClient;
 class PropertyTrees;
 class Region;
+class RemoteProtoChannel;
 class RenderingStatsInstrumentation;
 class ResourceProvider;
 class ResourceUpdateQueue;
@@ -97,8 +98,23 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
   static scoped_ptr<LayerTreeHost> CreateSingleThreaded(
       LayerTreeHostSingleThreadClient* single_thread_client,
       InitParams* params);
+
+  static scoped_ptr<LayerTreeHost> CreateRemote(
+      RemoteProtoChannel* remote_proto_channel,
+      InitParams* params);
+
+  static scoped_ptr<LayerTreeHost> CreateDeserializable(
+      scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
+      InitParams* params);
+
   virtual ~LayerTreeHost();
 
+  // Should be called only for the remote mode.
+  void ToProtobuf();
+
+  // Should be called only for the deserializable mode.
+  void FromProtobuf();
+
   // LayerTreeHost interface to Proxy.
   void WillBeginMainFrame();
   void DidBeginMainFrame();
@@ -376,6 +392,12 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
       LayerTreeHostSingleThreadClient* single_thread_client,
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
+  void InitializeRemote(
+      RemoteProtoChannel* remote_proto_channel,
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner);
+  void InitializeDeserializable(
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   void InitializeForTesting(
       scoped_ptr<TaskRunnerProvider> task_runner_provider,
       scoped_ptr<Proxy> proxy_for_testing,
@@ -415,6 +437,8 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
 
   bool IsSingleThreaded() const;
   bool IsThreaded() const;
+  bool IsRemote() const;

[vmpstr, 2016/01/07 19:08:12]

At some point, these function should just become

CompositorMode mode() { return compositor_mode_; }

[Khushal, 2016/01/08 21:17:19]

Updated these functions to IsRemoteServer and IsRemoteClient. The only purpose
of adding them here is for DCHECKs for calls that should be made either on the
server or on the client. Do you think we should avoid doing that?

+  bool IsDeserializable() const;
 
   struct UIResourceClientData {
     UIResourceClient* client;