Enabling page visibility api in the chrome browser.

content/browser/renderer_host/render_view_host.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/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 232 matching lines @@
 
 void RenderViewHost::NavigateToURL(const GURL& url) {
   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 = url;
   params.transition = PageTransition::LINK;
   params.navigation_type = ViewMsg_Navigate_Type::NORMAL;
+  DCHECK(delegate_);

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

This assertion isn't really helping since if it fails, the code will immediately
crash with an obvious null pointer exception. I usually just tell people to not
bother DCHECKing something that will immediately crash in a predictable way.

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

Removed.

+  params.is_hidden = delegate_->IsHidden();
   Navigate(params);
 }
 
 void RenderViewHost::SetNavigationsSuspended(bool suspend) {
   // This should only be called to toggle the state.
   DCHECK(navigations_suspended_ != suspend);
 
   navigations_suspended_ = suspend;
   if (!suspend && suspended_nav_message_.get()) {
     // There's a navigation message waiting to be sent.  Now that we're not
@@ skipping 1163 matching lines @@
   if (view) {
     view->ShowPopupMenu(params.bounds,
                         params.item_height,
                         params.item_font_size,
                         params.selected_item,
                         params.popup_items,
                         params.right_aligned);
   }
 }
 #endif