cc:: Add remote mode to the compositor

cc/test/threaded_channel_for_test.h

Index: cc/test/threaded_channel_for_test.h
diff --git a/cc/test/threaded_channel_for_test.h b/cc/test/threaded_channel_for_test.h
index bd74790473218d80c92939e5fb22358035e3397d..6a47d10cfb990567f9c3ff1101d7001e703ae61b 100644
--- a/cc/test/threaded_channel_for_test.h
+++ b/cc/test/threaded_channel_for_test.h
@@ -10,15 +10,18 @@
 #include "cc/trees/threaded_channel.h"
 
 namespace cc {
+class ProxyImplForTest;
 
 // ThreadedChannel that notifies |test_hooks| of internal actions by ProxyImpl.
 class ThreadedChannelForTest : public ThreadedChannel {
  public:
-  static scoped_ptr<ThreadedChannel> Create(
+  static scoped_ptr<ThreadedChannelForTest> Create(
       TestHooks* test_hooks,
       ProxyMain* proxy_main,
       TaskRunnerProvider* task_runner_provider);
 
+  ProxyImplForTest* proxy_impl_for_test() { return proxy_impl_for_test_; }
+
  private:
   ThreadedChannelForTest(TestHooks* test_hooks,
                          ProxyMain* proxy_main,
@@ -31,6 +34,7 @@ class ThreadedChannelForTest : public ThreadedChannel {
       scoped_ptr<BeginFrameSource> external_begin_frame_source) override;
 
   TestHooks* test_hooks_;
+  ProxyImplForTest* proxy_impl_for_test_;
 };
 
 }  // namespace cc