Upstream PO2TS_IOS unit test.

components/signin/core/browser/test_signin_client.cc

 // 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.
 
 #include "base/logging.h"
 #include "components/signin/core/browser/test_signin_client.h"
 #include "components/signin/core/browser/webdata/token_service_table.h"
 #include "components/webdata/common/web_data_service_base.h"
 #include "components/webdata/common/web_database_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if defined(OS_IOS)
+#include "ios/public/test/fake_profile_oauth2_token_service_ios_provider.h"
+#endif
+
 TestSigninClient::TestSigninClient()
     : request_context_(new net::TestURLRequestContextGetter(
           base::MessageLoopProxy::current())) {
   LoadDatabase();
 }
 
 TestSigninClient::~TestSigninClient() {}
 
 PrefService* TestSigninClient::GetPrefs() { return NULL; }
 
@@ skipping 27 matching lines @@
 
 bool TestSigninClient::ShouldMergeSigninCredentialsIntoCookieJar() {
   return true;
 }
 
 void TestSigninClient::SetCookieChangedCallback(
     const CookieChangedCallback& callback) {}
 
 #if defined(OS_IOS)
 ios::ProfileOAuth2TokenServiceIOSProvider* TestSigninClient::GetIOSProvider() {
-  // Just returns NULL for now. It should be changed to return an
-  // |ios::FakeProfileOAuth2TokenServiceIOSProvider|.
-  return NULL;
+  return GetIOSProviderAsFake();
+}
+
+ios::FakeProfileOAuth2TokenServiceIOSProvider*
+TestSigninClient::GetIOSProviderAsFake() {
+  if (!iosProvider_) {
+    iosProvider_.reset(new ios::FakeProfileOAuth2TokenServiceIOSProvider());
+  }
+  return iosProvider_.get();
 }
 #endif