Refactor MainHook into TestSuite.

base/test/test_support_ios.h

 // 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.
 
 #ifndef BASE_TEST_TEST_SUPPORT_IOS_H_
 #define BASE_TEST_TEST_SUPPORT_IOS_H_
 
+#include "base/test/test_suite.h"
+
 namespace base {
 
-// Init the message loop for tests on iOS.
+// Inits the message loop for tests on iOS.
 void InitIOSTestMessageLoop();
 
+// Inits the run hook for tests on iOS.
+void InitIOSRunHook(TestSuite* suite, int argc, char* argv[]);
+
+// Launches an iOS app that runs the tests in the suite passed to
+// InitIOSRunHook.
+void RunTestsFromIOSApp();
+
 }  // namespace base
 
 #endif  // BASE_TEST_TEST_SUPPORT_IOS_H_