alternate ntp: toolbar background and separator animation

chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc

Index: chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
diff --git a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
index fa7ccf814c36fe00da175bf9a66f1905329a1eda..c5e5a0d63ed0c7a983aa2afc916825d79df38370 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
@@ -443,7 +443,9 @@ void BrowserTabStripController::TabBlockedStateChanged(
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserTabStripController, chrome::search::SearchModelObserver:
 
-void BrowserTabStripController::ModeChanged(const chrome::search::Mode& mode) {
+void BrowserTabStripController::ModeChanged(
+    const chrome::search::Mode& old_mode,
+    const chrome::search::Mode& new_mode) {
   // Mode has changed, set tab data based on new mode, which will trigger
   // repainting of tab's background.
   int active_index = GetActiveIndex();
@@ -471,8 +473,8 @@ void BrowserTabStripController::OnToolbarBackgroundAnimatorCanceled(
   //    the formal parameter: make sure |tab_contents| still exist in tab model.
   // 2) mode change of active tab, as indicated by a NULL |tab_contents|: make
   //    sure active tab exists, and retrieve its |tab_contents|.
-  // If we proceed, set tab data so that |TabRendererData::background_state| and
-  // |TabRendererData::search_background_opacity| will be reset.
+  // If we proceed, set tab data so that
+  // |TabRendererData::gradient_background_opacity| will be reset.
   // Repainting of tab's background will be triggered in the process.
   int index = tab_contents ? model_->GetIndexOfTabContents(tab_contents) :
                              GetActiveIndex();
@@ -521,18 +523,9 @@ void BrowserTabStripController::SetTabRendererDataFromModel(
   data->blocked = model_->IsTabBlocked(model_index);
   data->app = tab_contents->extension_tab_helper()->is_app();
   data->mode = browser_->search_model()->mode().mode;
-  if (data->mode == chrome::search::Mode::MODE_SEARCH) {
-    // Get current state of background animation to paint for SEARCH mode.
-    browser_->search_delegate()->toolbar_search_animator().
-        GetCurrentBackgroundState(&data->background_state,
-                                  &data->search_background_opacity);
-  } else {
-    data->background_state =
-        chrome::search::ToolbarSearchAnimator::BACKGROUND_STATE_DEFAULT;
-    // Valid opacity value of double data type is 0f to 1f, so use -1f to
-    // indicate an invalid value.
-    data->search_background_opacity = -1.0f;
-  }
+  // Get current gradient background animation to paint.
+  data->gradient_background_opacity = browser_->search_delegate()->
+      toolbar_search_animator().GetGradientOpacity();
 }
 
 void BrowserTabStripController::SetTabDataAt(