Introduce FakeChromeIdentity and FakeChromeIdentityService.

ios/provider/ios_provider_chrome.gyp

 # Copyright 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.
 {
   'variables': {
     'chromium_code': 1,
    },
   'targets': [
     {
       # GN version: //ios/public/provider/chrome/browser
@@ skipping 33 matching lines @@
         '../../net/net.gyp:net',
         '../web/ios_web.gyp:ios_web',
         'ios_provider_web.gyp:ios_provider_web',
       ],
     },
     {
       # GN version: //ios/public/provider/chrome/browser:test_support
       'target_name': 'ios_provider_chrome_browser_test_support',
       'type': 'static_library',
       'sources': [
+        '../public/provider/chrome/browser/signin/fake_chrome_identity.h',
+        '../public/provider/chrome/browser/signin/fake_chrome_identity.mm',
+        '../public/provider/chrome/browser/signin/fake_chrome_identity_service.h',
+        '../public/provider/chrome/browser/signin/fake_chrome_identity_service.mm',
         '../public/provider/chrome/browser/test_chrome_browser_provider.h',
         '../public/provider/chrome/browser/test_chrome_browser_provider.mm',
         '../public/provider/chrome/browser/test_chrome_provider_initializer.h',
         '../public/provider/chrome/browser/test_chrome_provider_initializer.mm',
         '../public/provider/chrome/browser/test_updatable_resource_provider.h',
         '../public/provider/chrome/browser/test_updatable_resource_provider.mm',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
         '../../components/components.gyp:signin_ios_browser_test_support',
+        '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         'ios_provider_chrome_browser',
       ],
     },
   ],
 }