cc:: Add remote mode to the compositor

cc/trees/compositor_mode.h

Index: cc/trees/compositor_mode.h
diff --git a/cc/trees/compositor_mode.h b/cc/trees/compositor_mode.h
index 649441966d1c1440fb4c1bd07a704f6aa2b452c1..3941a93ac3aa96c3389cefce2c33c317c4057614 100644
--- a/cc/trees/compositor_mode.h
+++ b/cc/trees/compositor_mode.h
@@ -12,10 +12,20 @@ namespace cc {
 // 1) Safely cast Proxy to SingleThreadProxy to allow operations only supported
 // in SingleThreaded mode.
 // 2) Make decisions restricted to either browser(SingleThreaded) or renderer
-// compositors(Threaded).
+// compositors(Threaded/Remote).
 enum CompositorMode {
+  // The main and impl components will be run on the same thread.
   SingleThreaded,
+
+  // The main and impl components be run on different threads.
   Threaded,
+
+  // The main and impl components will be run across the network.
+  Remote,
+
+  // The commit data from the remote compositor will be deserialized to this
+  // LayerTreeHost to be used by the impl components during the commit.
+  Deserializable,
 };
 
 }  // namespace cc