Enabling page visibility api in the chrome browser.

content/renderer/render_view.cc

 // 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.
 
 #include "content/renderer/render_view.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <vector>
@@ skipping 3870 matching lines @@
 void RenderView::DidHandleMouseEvent(const WebKit::WebMouseEvent& event) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidHandleMouseEvent(event));
 }
 
 void RenderView::OnWasHidden() {
   RenderWidget::OnWasHidden();
 
   if (webview()) {
     webview()->settings()->setMinimumTimerInterval(
         webkit_glue::kBackgroundTabTimerInterval);
+    webview()->setVisibilityState(WebKit::WebPageVisibilityStateHidden, false);
   }
 
 #if defined(OS_MACOSX)
   // Inform plugins that their container is no longer visible.
   std::set<WebPluginDelegateProxy*>::iterator plugin_it;
   for (plugin_it = plugin_delegates_.begin();
        plugin_it != plugin_delegates_.end(); ++plugin_it) {
     (*plugin_it)->SetContainerVisibility(false);
   }
 #endif  // OS_MACOSX
 }
 
 void RenderView::OnWasRestored(bool needs_repainting) {
   RenderWidget::OnWasRestored(needs_repainting);
 
   if (webview()) {
     webview()->settings()->setMinimumTimerInterval(
         webkit_glue::kForegroundTabTimerInterval);
+    webview()->setVisibilityState(WebKit::WebPageVisibilityStateVisible, false);
   }
 
 #if defined(OS_MACOSX)
   // Inform plugins that their container is now visible.
   std::set<WebPluginDelegateProxy*>::iterator plugin_it;
   for (plugin_it = plugin_delegates_.begin();
        plugin_it != plugin_delegates_.end(); ++plugin_it) {
     (*plugin_it)->SetContainerVisibility(true);
   }
 #endif  // OS_MACOSX
@@ skipping 180 matching lines @@
   if (base.GetOrigin() != absolute_url.GetOrigin()) {
     return;
   }
   RenderThread::current()->Send(
       new ViewHostMsg_RegisterProtocolHandler(routing_id_,
                                               UTF16ToUTF8(scheme),
                                               absolute_url,
                                               title));
 }
 
+WebKit::WebPageVisibilityState RenderView::visibilityState() const {
+  if (is_hidden())
+    return WebKit::WebPageVisibilityStateHidden;
+  else
+    return WebKit::WebPageVisibilityStateVisible;
+}
+
 bool RenderView::IsNonLocalTopLevelNavigation(
     const GURL& url, WebKit::WebFrame* frame, WebKit::WebNavigationType type) {
   // Must be a top level frame.
   if (frame->parent() != NULL)
     return false;
 
   // Navigations initiated within Webkit are not sent out to the external host
   // in the following cases.
   // 1. The url scheme is not http/https
   // 2. The origin of the url and the opener is the same in which case the
@@ skipping 73 matching lines @@
     const webkit_glue::CustomContextMenuContext& custom_context) {
   if (custom_context.is_pepper_menu)
     pepper_delegate_.OnContextMenuClosed(custom_context);
   else
     context_menu_node_.reset();
 }
 
 void RenderView::OnNetworkStateChanged(bool online) {
   WebNetworkStateNotifier::setOnLine(online);
 }