Make proto enums canonical for ReadState/WriteState/ConnectState.

extensions/browser/api/api_registration.gyp

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       # GN version: //extensions/browser/api
       'target_name': 'extensions_api_registration',
       'type': 'static_library',
       # TODO(jschuh): http://crbug.com/167187 size_t -> int
       'msvs_disabled_warnings': [ 4267 ],
       'includes': [
         '../../../build/json_schema_bundle_registration_compile.gypi',
         '../../common/api/schemas.gypi',
       ],
       'dependencies': [
         '<(DEPTH)/extensions/common/api/api.gyp:extensions_api',
       ],
       'conditions': [
         ['enable_extensions==1', {
           'dependencies': [
             '<(DEPTH)/device/serial/serial.gyp:device_serial_mojo',
+            '<(DEPTH)/extensions/common/api/api.gyp:cast_channel_proto',
             '<(DEPTH)/skia/skia.gyp:skia',
           ],
         }],
       ],
     },
   ],
 }