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

chrome/browser/ui/views/tabs/tab_controller.h

Index: chrome/browser/ui/views/tabs/tab_controller.h
diff --git a/chrome/browser/ui/views/tabs/tab_controller.h b/chrome/browser/ui/views/tabs/tab_controller.h
index 1ab66b17663ec7d20119033fd95b373bf9e12093..1955d11f4cc438e11843a5692a93672869217f3b 100644
--- a/chrome/browser/ui/views/tabs/tab_controller.h
+++ b/chrome/browser/ui/views/tabs/tab_controller.h
@@ -84,6 +84,9 @@ class TabController {
   // set to the clip (if |clip| is empty means no clip).
   virtual bool ShouldPaintTab(const BaseTab* tab, gfx::Rect* clip) = 0;
 
+  // Returns true if Instant Extended API is enabled.
+  virtual bool IsInstantExtendedAPIEnabled() = 0;
+
  protected:
   virtual ~TabController() {}
 };