Improves tab overview.

chrome/browser/views/tabs/tab_overview_controller.h

Index: chrome/browser/views/tabs/tab_overview_controller.h
===================================================================
--- chrome/browser/views/tabs/tab_overview_controller.h	(revision 19730)
+++ chrome/browser/views/tabs/tab_overview_controller.h	(working copy)
@@ -54,6 +54,9 @@
   // offscren if the user detaches the last tab in the tab strip.
   bool moved_offscreen() const { return moved_offscreen_; }
 
+  // Sets whether the mouse is over a mini-window.
+  void SetMouseOverMiniWindow(bool over_mini_window);
+
   // Shows the grid.
   void Show();
 
@@ -126,6 +129,9 @@
   // it. If all the thumnbails have been set configure_timer_ is stopped.
   void ConfigureNextUnconfiguredCell();
 
+  // Starts the delay timer.
+  void StartDelayTimer();
+
   // The widget showing the view.
   views::Widget* host_;