Make it possible to run gtests on iOS.

base/test/main_hook.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.
+
+#include "build/build_config.h"
+#include "base/basictypes.h"
+
+// Provides a way of running code before gtest-based tests with access to
+// argv and argc.
+class MainHook {
+ public:
+  typedef int (*MainType)(int, char*[]);
+  MainHook(MainType main_func, int argc, char* argv[]);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MainHook);
+};