Add Protobuf support in cc for gfx objects

cc/proto/rect.proto

Index: cc/proto/rect.proto
diff --git a/blimp/common/proto/common.proto b/cc/proto/rect.proto
similarity index 59%
copy from blimp/common/proto/common.proto
copy to cc/proto/rect.proto
index 578c02b63b78d3b0e09bedfc4582d517d2c263cb..a0194b185d8954112eef235f63a9c52ea1050b5b 100644
--- a/blimp/common/proto/common.proto
+++ b/cc/proto/rect.proto
@@ -1,17 +1,17 @@
 // Copyright 2015 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.
-//
-// Common message types for sharing across Blimp subprotocols.
 
 syntax = "proto2";
 
+import "point.proto";
+import "size.proto";
+
 option optimize_for = LITE_RUNTIME;
 
-package blimp;
+package cc.proto;
 
-message CoordinatePair {
-  optional sint32 x = 1;
-  optional sint32 y = 2;
+message Rect {
+  optional cc.proto.Point origin = 1;
+  optional cc.proto.Size size = 2;
 }
-