Identity API: Add chrome.identity.onSignInChanged routing and IDL

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 266 matching lines @@
         'browser/extensions/api/i18n/i18n_api.cc',
         'browser/extensions/api/i18n/i18n_api.h',
         'browser/extensions/api/identity/experimental_identity_api.cc',
         'browser/extensions/api/identity/experimental_identity_api.h',
         'browser/extensions/api/identity/experimental_web_auth_flow.cc',
         'browser/extensions/api/identity/experimental_web_auth_flow.h',
         'browser/extensions/api/identity/gaia_web_auth_flow.cc',
         'browser/extensions/api/identity/gaia_web_auth_flow.h',
         'browser/extensions/api/identity/identity_api.cc',
         'browser/extensions/api/identity/identity_api.h',
+        'browser/extensions/api/identity/identity_event_router.cc',
+        'browser/extensions/api/identity/identity_event_router.h',
         'browser/extensions/api/identity/identity_mint_queue.cc',
         'browser/extensions/api/identity/identity_mint_queue.h',
         'browser/extensions/api/identity/identity_signin_flow.cc',
         'browser/extensions/api/identity/identity_signin_flow.h',
         'browser/extensions/api/identity/web_auth_flow.cc',
         'browser/extensions/api/identity/web_auth_flow.h',
         'browser/extensions/api/identity_private/identity_private_api.cc',
         'browser/extensions/api/identity_private/identity_private_api.h',
         'browser/extensions/api/idle/idle_api.cc',
         'browser/extensions/api/idle/idle_api.h',
@@ skipping 856 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }