Enabling page visibility api in the chrome browser.

content/renderer/render_view.h

 // Copyright (c) 2011 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_RENDERER_RENDER_VIEW_H_
 #define CONTENT_RENDERER_RENDER_VIEW_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 16 matching lines @@
 #include "content/common/page_zoom.h"
 #include "content/common/renderer_preferences.h"
 #include "content/renderer/pepper_plugin_delegate_impl.h"
 #include "content/renderer/render_widget.h"
 #include "ipc/ipc_platform_file.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAccessibilityNotification.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFileSystem.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNavigationType.h"
 #include "ui/gfx/surface/transport_dib.h"
 #include "webkit/glue/webpreferences.h"
 #include "webkit/plugins/npapi/webplugin_page_delegate.h"
 
 #if defined(OS_WIN)
 // RenderView is a diamond-shaped hierarchy, with WebWidgetClient at the root.
 // VS warns when we inherit the WebWidgetClient method implementations from
@@ skipping 372 matching lines @@
   virtual WebKit::WebGeolocationClient* geolocationClient();
   virtual WebKit::WebSpeechInputController* speechInputController(
       WebKit::WebSpeechInputListener* listener);
   virtual WebKit::WebDeviceOrientationClient* deviceOrientationClient();
   virtual void zoomLimitsChanged(double minimum_level, double maximum_level);
   virtual void zoomLevelChanged();
   virtual void registerProtocolHandler(const WebKit::WebString& scheme,
                                        const WebKit::WebString& base_url,
                                        const WebKit::WebString& url,
                                        const WebKit::WebString& title);
+  virtual WebKit::WebPageVisibilityState visibilityState() const;
 
   // WebKit::WebFrameClient implementation -------------------------------------
 
   virtual WebKit::WebPlugin* createPlugin(
       WebKit::WebFrame* frame,
       const WebKit::WebPluginParams& params);
   virtual WebKit::WebWorker* createWorker(WebKit::WebFrame* frame,
                                           WebKit::WebWorkerClient* client);
   virtual WebKit::WebSharedWorker* createSharedWorker(
       WebKit::WebFrame* frame, const WebKit::WebURL& url,
@@ skipping 714 matching lines @@
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.  You can use
   // the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_H_