cc:: Add remote mode to the compositor

cc/trees/layer_tree_host.h

 // Copyright 2011 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_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 43 matching lines @@
 class AnimationRegistrar;
 class AnimationHost;
 class BeginFrameSource;
 class HeadsUpDisplayLayer;
 class Layer;
 class LayerTreeHostImpl;
 class LayerTreeHostImplClient;
 class LayerTreeHostSingleThreadClient;
 class PropertyTrees;
 class Region;
+class RemoteProtoChannel;
 class RenderingStatsInstrumentation;
 class ResourceProvider;
 class ResourceUpdateQueue;
 class SharedBitmapManager;
 class TaskGraphRunner;
 class TopControlsManager;
 class UIResourceRequest;
 struct PendingPageScaleAnimation;
 struct RenderingStats;
 struct ScrollAndScaleSet;
@@ skipping 16 matching lines @@
   };
 
   // The SharedBitmapManager will be used on the compositor thread.
   static scoped_ptr<LayerTreeHost> CreateThreaded(
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
       InitParams* params);
 
   static scoped_ptr<LayerTreeHost> CreateSingleThreaded(
       LayerTreeHostSingleThreadClient* single_thread_client,
       InitParams* params);
+
+  static scoped_ptr<LayerTreeHost> CreateRemoteServer(
+      RemoteProtoChannel* remote_proto_channel,
+      InitParams* params);
+
+  // The lifetime of this LayerTreeHost is tied to the lifetime of the remote
+  // server LayerTreeHost. It should be created on receiving
+  // CompositorMessageToImpl::InitializeImpl message and destroyed on receiving
+  // a CompositorMessageToImpl::CloseImpl message from the server. This ensures
+  // that the client will not send any compositor messages once the
+  // LayerTreeHost on the server is destroyed.
+  static scoped_ptr<LayerTreeHost> CreateRemoteClient(
+      RemoteProtoChannel* remote_proto_channel,
+      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.

[vmpstr, 2016/01/11 21:50:15]

This isn't a mode anymore, can you update the comment? I think the
ToProtobuf/FromProtobuf should share a comment

[Khushal, 2016/01/13 02:07:12]

I'll just remove these. Tommy is already working on a patch to add these
methods. His will probably land before mine. I'll add the DCHECKs in the
implementation when I rebase and include his changes.

+  void FromProtobuf();
+
   // LayerTreeHost interface to Proxy.
   void WillBeginMainFrame();
   void DidBeginMainFrame();
   void BeginMainFrame(const BeginFrameArgs& args);
   void BeginMainFrameNotExpectedSoon();
   void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
   void DidStopFlinging();
   void RequestMainFrameUpdate();
   void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void WillCommit();
@@ skipping 257 matching lines @@
  protected:
   LayerTreeHost(InitParams* params, CompositorMode mode);
   void InitializeThreaded(
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
   void InitializeSingleThreaded(
       LayerTreeHostSingleThreadClient* single_thread_client,
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
+  void InitializeRemoteServer(
+      RemoteProtoChannel* remote_proto_channel,
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner);
+  void InitializeRemoteClient(
+      RemoteProtoChannel* remote_proto_channel,
+      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,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
   void SetOutputSurfaceLostForTesting(bool is_lost) {
     output_surface_lost_ = is_lost;
   }
   void SetTaskRunnerProviderForTesting(
       scoped_ptr<TaskRunnerProvider> task_runner_provider);
 
@@ skipping 19 matching lines @@
       scoped_ptr<Proxy> proxy,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
 
   bool DoUpdateLayers(Layer* root_layer);
   void UpdateHudLayer();
 
   bool AnimateLayersRecursive(Layer* current, base::TimeTicks time);
 
   bool IsSingleThreaded() const;
   bool IsThreaded() const;
+  bool IsRemoteServer() const;
+  bool IsRemoteClient() const;
 
   struct UIResourceClientData {
     UIResourceClient* client;
     gfx::Size size;
   };
 
   typedef base::hash_map<UIResourceId, UIResourceClientData>
       UIResourceClientMap;
   UIResourceClientMap ui_resource_client_map_;
   int next_ui_resource_id_;
@@ skipping 92 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_