cros: Expose client_id via chromeosInfoPrivate.

chrome/common/extensions/api/chromeos_info_private.json

 // Copyright (c) 2012 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.
 
 [
   {
     "namespace": "chromeosInfoPrivate",
     "description": "none",
     "compiler_options": {
       "implemented_in": "chrome/browser/chromeos/extensions/info_private_api.h"
@@ skipping 20 matching lines @@
                 "name": "propertiesDictionary",
                 "type": "object",
                 "description": "Dictionary which contains all requested properties",
                 "properties": {
                   "board" : {"type": "string", "optional": true, "description": "Board name"},
                   "customizationId": {"type": "string", "optional": true, "description": "Customization ID"},
                   "homeProvider" : {"type": "string", "optional": true, "description": "Home provider which is used by the cellular device"},
                   "hwid": {"type": "string", "optional": true, "description": "Hardware ID"},
                   "initialLocale" : {"type": "string", "optional": true, "description": "Initial locale for the device"},
                   "isOwner" : {"type": "boolean", "optional": true, "description": "True if current logged in user is device owner"},
+                  "clientId" : {"type": "string", "optional": true, "description": "Device client id"},
                   "timezone" : {"type": "string", "optional": true, "description": "Timezone"},
                   "a11yLargeCursorEnabled" : {"type": "boolean", "optional": true, "description": "If true, ChromeOS is showing enlarged cursor."},
                   "a11yStickyKeysEnabled" : {"type": "boolean", "optional": true, "description": "If true, sticky keys are turned on."},
                   "a11ySpokenFeedbackEnabled" : {"type": "boolean", "optional": true, "description": "If enabled, ChromeOS text-to-speech feature is turned on."},
                   "a11yHighContrastEnabled" : {"type": "boolean", "optional": true, "description": "If true, all displays have high contrast mode turned on."},
                   "a11yScreenMagnifierEnabled" : {"type": "boolean", "optional": true, "description": "If true, all displays have screen magnifier turned on."},
                   "a11yAutoClickEnabled" : {"type": "boolean", "optional": true, "description": "If true, auto mouse click accessibility feature is turned on."},
                   "a11yVirtualKeyboardEnabled" : {"type": "boolean", "optional": true, "description": "If true, virtual keyboard will be enabled."},
                   "sendFunctionKeys" : {"type": "boolean", "optional": true, "description": "If true, the ChromeOS top row keys send function keys."},
                   "supportedTimezones" : {
@@ skipping 33 matching lines @@
           {
             "name": "propertyValue",
             "type": "any",
             "description": "Chrome OS system property value"
           }
         ]
       }
     ]
   }
 ]