cc:: Add remote mode to the compositor

cc/proto/compositor_message_to_main.proto

Index: cc/proto/compositor_message_to_main.proto
diff --git a/cc/proto/compositor_message_to_main.proto b/cc/proto/compositor_message_to_main.proto
new file mode 100644
index 0000000000000000000000000000000000000000..10013a9107bb2fcbc348d0e7d2dc8615c08d13f1
--- /dev/null
+++ b/cc/proto/compositor_message_to_main.proto
@@ -0,0 +1,16 @@
+// Copyright 2016 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.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package cc.proto;
+
+// Control messages sent to the main side of the compositor(server) from the
+// impl side of the compositor(client).
+message CompositorMessageToMain {
+  // TODO(khushalsagar): Add messages sent to the main compositor from the impl
+  // side.
+}