alternate ntp (cros/partial-win): add tab-related stuff and toolbar/tab background change

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 3fd204f9917c84592fb7aa8e0569d9aaf838a51b..e8901c677391faa6dbdd1db3d349d4e85c9b9216 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
@@ -12,6 +12,9 @@
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/search/search.h"
+#include "chrome/browser/ui/search/search_delegate.h"
+#include "chrome/browser/ui/search/search_model.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/browser/ui/tabs/tab_menu_model.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -166,6 +169,8 @@ BrowserTabStripController::BrowserTabStripController(Browser* browser,
       browser_(browser),
       hover_tab_selector_(model) {
   model_->AddObserver(this);
+  browser_->search_model()->AddObserver(this);
+  browser_->search_delegate()->toolbar_search_animator().AddObserver(this);
 
   local_pref_registrar_.Init(g_browser_process->local_state());
   local_pref_registrar_.Add(prefs::kTabStripLayoutType, this);
@@ -179,6 +184,8 @@ BrowserTabStripController::~BrowserTabStripController() {
     context_menu_contents_->Cancel();
 
   model_->RemoveObserver(this);
+  browser_->search_delegate()->toolbar_search_animator().RemoveObserver(this);
+  browser_->search_model()->RemoveObserver(this);
 }
 
 void BrowserTabStripController::InitFromModel(TabStrip* tabstrip) {
@@ -433,6 +440,48 @@ void BrowserTabStripController::TabBlockedStateChanged(
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// BrowserTabStripController, chrome::search::SearchModelObserver:
+
+void BrowserTabStripController::ModeChanged(const chrome::search::Mode& mode) {
+  // Mode has changed, set tab data based on new mode, which will trigger
+  // repainting of tab's background.
+  int active_index = GetActiveIndex();
+  DCHECK_NE(active_index, -1);
+  SetTabDataAt(browser_->GetTabContentsAt(active_index), active_index);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// BrowserTabStripController, chrome::search::ToolbarSearchAnimator::Observer:
+
+void BrowserTabStripController::OnToolbarBackgroundAnimatorProgressed() {
+  // We're fading in the tab background, set tab data based on new background
+  // state and possibly opacity value, which will trigger repainting of tab's
+  // background.
+  int active_index = GetActiveIndex();
+  DCHECK_NE(active_index, -1);
+  SetTabDataAt(browser_->GetTabContentsAt(active_index), active_index);
+}
+
+void BrowserTabStripController::OnToolbarBackgroundAnimatorCanceled(
+    TabContents* tab_contents) {
+  // Fade in of tab background has been canceled, which can happen in 2
+  // scenarios:
+  // 1) a deactivated or detached or closing tab, whose |tab_contents| is the
+  //    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.
+  // Repainting of tab's background will be triggered in the process.
+  int index = tab_contents ? model_->GetIndexOfTabContents(tab_contents) :
+                             GetActiveIndex();
+  if (index == -1)
+    return;
+  SetTabDataAt(tab_contents ? tab_contents : browser_->GetTabContentsAt(index),
+               index);
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // BrowserTabStripController, content::NotificationObserver implementation:
 
 void BrowserTabStripController::Observe(int type,
@@ -474,6 +523,19 @@ void BrowserTabStripController::SetTabRendererDataFromModel(
   data->mini = model_->IsMiniTab(model_index);
   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;
+  }
 }
 
 void BrowserTabStripController::SetTabDataAt(