Add Protobuf support in cc for gfx objects

cc/proto/cc_proto_export.h

Index: cc/proto/cc_proto_export.h
diff --git a/cc/proto/cc_proto_export.h b/cc/proto/cc_proto_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..23617b3744edd553d67adea47568d14f055d99a4
--- /dev/null
+++ b/cc/proto/cc_proto_export.h
@@ -0,0 +1,29 @@
+// 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.
+
+#ifndef CC_PROTO_CC_PROTO_EXPORT_H_
+#define CC_PROTO_CC_PROTO_EXPORT_H_
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(CC_PROTO_IMPLEMENTATION)
+#define CC_PROTO_EXPORT __declspec(dllexport)
+#else
+#define CC_PROTO_EXPORT __declspec(dllimport)
+#endif  // defined(CC_PROTO_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(CC_PROTO_IMPLEMENTATION)
+#define CC_PROTO_EXPORT __attribute__((visibility("default")))
+#else
+#define CC_PROTO_EXPORT
+#endif  // defined(CC_PROTO_IMPLEMENTATION)
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define CC_PROTO_EXPORT
+#endif
+
+#endif  // CC_PROTO_CC_PROTO_EXPORT_H_