Initial implementation of API WakeLock.

content/browser/wake_lock/wake_lock_web_contents_observer.cc

+// 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.
+
+#include "content/browser/wake_lock/wake_lock_web_contents_observer.h"
+
+#include "content/browser/wake_lock/wake_lock_manager.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/web_contents.h"
+
+namespace content {
+
+WakeLockWebContentsObserver::WakeLockWebContentsObserver(
+    content::WebContents* webContent)
+    : content::WebContentsObserver(webContent) {
+}
+
+void WakeLockWebContentsObserver::WasShown() {
+  WakeLockManager::GetInstance()->tabWasShown(
+      web_contents()->GetRenderProcessHost()->GetID(),
+      web_contents()->GetRoutingID());
+}
+
+void WakeLockWebContentsObserver::WasHidden() {
+  WakeLockManager::GetInstance()->tabWasHidden(
+      web_contents()->GetRenderProcessHost()->GetID(),
+      web_contents()->GetRoutingID());
+}
+}