Upstream Chrome on iOS source code [1/11].

ios/chrome/app/startup/ios_chrome_main.h

+// Copyright 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 IOS_CHROME_APP_STARTUP_IOS_CHROME_MAIN_H_
+#define IOS_CHROME_APP_STARTUP_IOS_CHROME_MAIN_H_
+
+#include <memory>
+
+#include "ios/chrome/app/startup/ios_chrome_main_delegate.h"
+
+namespace base {
+class Time;
+}
+
+namespace web {
+class WebMainRunner;
+}
+
+// Encapsulates any setup and initialization that is needed by common
+// Chrome code.  A single instance of this object should be created during app
+// startup (or shortly after launch), and clients must ensure that this object
+// is not destroyed while Chrome code is still on the stack.
+class IOSChromeMain {
+ public:
+  IOSChromeMain();
+  ~IOSChromeMain();
+
+  // The time main() starts.  Only call from main().
+  static void InitStartTime();
+
+  // Returns the time that main() started.  Used for performance tests.
+  // InitStartTime() must has been called before.
+  static const base::Time& StartTime();
+
+ private:
+  IOSChromeMainDelegate main_delegate_;
+  std::unique_ptr<web::WebMainRunner> web_main_runner_;
+};
+
+#endif  // IOS_CHROME_APP_STARTUP_IOS_CHROME_MAIN_H_