Initial implementation of API WakeLock.

content/browser/wake_lock/wake_lock_web_contents_observer.h

+// Copyright (c) 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.
+
+#ifndef CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_WEB_CONTENTS_OBSERVER_H_
+#define CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_WEB_CONTENTS_OBSERVER_H_
+
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+
+class WakeLockWebContentsObserver : public content::WebContentsObserver {
+ public:
+  explicit WakeLockWebContentsObserver(content::WebContents* webContent);
+
+ private:
+  // WebContentsObserver
+  virtual void WasShown() OVERRIDE;
+  virtual void WasHidden() OVERRIDE;
+};
+}
+
+#endif  // CONTENT_BROWSER_WAKE_LOCK_WAKE_LOCK_WEB_CONTENTS_OBSERVER_H_