cc: Split ThreadProxy into ProxyMain and ProxyImpl

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 74dc211045a01d8f229ce22cd0ab28ab45af6cb1..88186d9a58be94144ba89459bdc96c2a33477ac9 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -41,8 +41,9 @@
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/layer_tree_impl.h"
+#include "cc/trees/proxy_main.h"
 #include "cc/trees/single_thread_proxy.h"
-#include "cc/trees/thread_proxy.h"
+#include "cc/trees/threaded_channel.h"
 #include "cc/trees/tree_synchronizer.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
@@ -139,8 +140,12 @@ void LayerTreeHost::InitializeThreaded(
     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
   task_runner_provider_ =
       TaskRunnerProvider::Create(main_task_runner, impl_task_runner);
-  InitializeProxy(ThreadProxy::Create(this, task_runner_provider_.get(),
-                                      external_begin_frame_source.Pass()));
+  scoped_ptr<ProxyMain> proxy_main = ProxyMain::Create(
+      this, task_runner_provider_.get(), external_begin_frame_source.Pass());
+  scoped_ptr<ThreadedChannel> threaded_channel =
+      ThreadedChannel::Create(proxy_main.get(), task_runner_provider_.get());
+  proxy_main->SetChannel(threaded_channel.Pass());

[Wez, 2015/11/21 01:00:29]

nit: Doesn't look like you need the |threaded_channel| local var here - just
pass the result of Create() directly to SetChannel?

[Khushal, 2015/11/23 20:07:19]

Done.

+  InitializeProxy(proxy_main.Pass());
 }
 
 void LayerTreeHost::InitializeSingleThreaded(