cc:: Add remote mode to the compositor

cc/trees/proxy_main.cc

Index: cc/trees/proxy_main.cc
diff --git a/cc/trees/proxy_main.cc b/cc/trees/proxy_main.cc
index dd5ac1afe5e6784188386ddec36905c46af43d1d..ac94309720925d29f2b500bde85df288ad71d838 100644
--- a/cc/trees/proxy_main.cc
+++ b/cc/trees/proxy_main.cc
@@ -16,6 +16,7 @@
 #include "cc/output/swap_promise.h"
 #include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host.h"
+#include "cc/trees/remote_channel_main.h"
 #include "cc/trees/scoped_abort_remaining_swap_promises.h"
 #include "cc/trees/threaded_channel.h"
 
@@ -33,6 +34,17 @@ scoped_ptr<ProxyMain> ProxyMain::CreateThreaded(
   return proxy_main;
 }
 
+scoped_ptr<ProxyMain> ProxyMain::CreateRemote(
+    RemoteProtoChannel* remote_proto_channel,
+    LayerTreeHost* layer_tree_host,
+    TaskRunnerProvider* task_runner_provider) {
+  scoped_ptr<ProxyMain> proxy_main(
+      new ProxyMain(layer_tree_host, task_runner_provider, nullptr));
+  proxy_main->SetChannel(RemoteChannelMain::Create(
+      remote_proto_channel, proxy_main.get(), task_runner_provider));
+  return proxy_main;
+}
+
 ProxyMain::ProxyMain(LayerTreeHost* layer_tree_host,
                      TaskRunnerProvider* task_runner_provider,
                      scoped_ptr<BeginFrameSource> external_begin_frame_source)
@@ -382,7 +394,6 @@ void ProxyMain::MainThreadHasStoppedFlinging() {
 
 void ProxyMain::Start() {
   DCHECK(IsMainThread());
-  DCHECK(task_runner_provider_->HasImplThread());
   DCHECK(channel_main_);
 
   // Create LayerTreeHostImpl.