Enabling page visibility api in the chrome browser.

chrome/browser/prerender/prerender_contents.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 "chrome/browser/prerender/prerender_contents.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/process_util.h"
@@ skipping 175 matching lines @@
   ViewMsg_Navigate_Params params;
   params.page_id = -1;
   params.pending_history_list_offset = -1;
   params.current_history_list_offset = -1;
   params.current_history_list_length = 0;
   params.url = prerender_url_;
   params.transition = PageTransition::LINK;
   params.navigation_type = ViewMsg_Navigate_Type::NORMAL;
   params.referrer = referrer_;
   params.request_time = base::Time::Now();
+  params.is_hidden = true;
 
   render_view_host_->Navigate(params);
 }
 
 void PrerenderContents::StartPrerendering(
     const RenderViewHost* source_render_view_host) {
   if (!UseTabContents()) {
     VLOG(1) << "Starting prerendering with LEGACY code";
     StartPrerenderingOld(source_render_view_host);
     return;
@@ skipping 346 matching lines @@
   Destroy(FINAL_STATUS_CLOSED);
 }
 
 RendererPreferences PrerenderContents::GetRendererPrefs(
     Profile* profile) const {
   RendererPreferences preferences;
   renderer_preferences_util::UpdateFromSystemSettings(&preferences, profile);
   return preferences;
 }
 
+bool PrerenderContents::IsHidden() const {
+  // Always in a hidden state,

[brettw, 2011/05/18 22:11:38]

comma -> period.

[Shishir, 2011/05/20 03:48:19]

Done.

+  return true;
+}
+
 WebPreferences PrerenderContents::GetWebkitPrefs() {
   return RenderViewHostDelegateHelper::GetWebkitPrefs(profile_,
                                                       false);  // is_web_ui
 }
 
 void PrerenderContents::CreateNewWindow(
     int route_id,
     const ViewHostMsg_CreateWindow_Params& params) {
   // TODO(dominich): Remove when we switch to TabContents.
   // Since we don't want to permit child windows that would have a
@@ skipping 187 matching lines @@
   //               used.
   if (UseTabContents()) {
     if (!prerender_contents_.get())
       return NULL;
     return prerender_contents_->render_view_host();
   }
   return render_view_host_;
 }
 
 }  // namespace prerender