alternate ntp: toolbar background and separator animation

chrome/browser/ui/search/search_tab_helper.cc

 // Copyright (c) 2012 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/ui/search/search_tab_helper.h"
 
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
@@ skipping 56 matching lines @@
   }
   model_.SetMode(Mode(mode, true));
 }
 
 void SearchTabHelper::NavigateToPendingEntry(
     const GURL& url,
     content::NavigationController::ReloadType reload_type) {
   if (!is_search_enabled_)
     return;
 
-  UpdateModel(url);
+  // Do not animate if this url is the very first navigation for the tab.
+  UpdateModel(url, !web_contents()->GetController().IsInitialNavigation());
 }
 
 void SearchTabHelper::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(content::NOTIFICATION_NAV_ENTRY_COMMITTED, type);
   content::LoadCommittedDetails* committed_details =
       content::Details<content::LoadCommittedDetails>(details).ptr();
-  UpdateModel(committed_details->entry->GetURL());
+  // TODO(dhollowa): NavigationController::IsInitialNavigation() is always false
+  // by the time NOTIFICATION_NAV_ENTRY_COMMITTED is received, so please handle
+  // it appropriately when restructuring NavigateToPendingEntry() and this
+  // methods.
+  UpdateModel(committed_details->entry->GetURL(),
+              !web_contents()->GetController().IsInitialNavigation());
 }
 
-void SearchTabHelper::UpdateModel(const GURL& url) {
+void SearchTabHelper::UpdateModel(const GURL& url, bool animate) {
   Mode::Type type = Mode::MODE_DEFAULT;
   if (IsNTP(url))
     type = Mode::MODE_NTP;
   else if (google_util::IsInstantExtendedAPIGoogleSearchUrl(url.spec()))
     type = Mode::MODE_SEARCH;
-  model_.SetMode(Mode(type, true));
+  model_.SetMode(Mode(type, animate));
 }
 
 }  // namespace search
 }  // namespace chrome