Add a fast path for tab strip expose.

chrome/browser/gtk/tabs/tab_strip_gtk.h

Index: chrome/browser/gtk/tabs/tab_strip_gtk.h
diff --git a/chrome/browser/gtk/tabs/tab_strip_gtk.h b/chrome/browser/gtk/tabs/tab_strip_gtk.h
index 5445654abb22913a246895179b36eea8db1c7637..6ba5793bcf9de29b1ce99da5fbc31c888330372c 100644
--- a/chrome/browser/gtk/tabs/tab_strip_gtk.h
+++ b/chrome/browser/gtk/tabs/tab_strip_gtk.h
@@ -251,6 +251,17 @@ class TabStripGtk : public TabStripModelObserver,
   // Sets the bounds of the tab and moves the tab widget to those bounds.
   void SetTabBounds(TabGtk* tab, const gfx::Rect& bounds);
 
+  // Returns true if |rects| are all areas that match up with tab favicons.
+  // |rects| must be sorted from left to right.  |tabs_to_paint| are the tab
+  // positions that match the rects.
+  bool CanPaintOnlyFavIcons(const GdkRectangle* rects,
+                            int num_rects,
+                            std::vector<int>* tabs_to_paint);
+
+  // Paints the tab favicon areas for tabs in |tabs_to_paint|.
+  void PaintOnlyFavIcons(GdkEventExpose* event,
+                         const std::vector<int>& tabs_to_paint);
+
   // Initializes the new tab button.
   CustomDrawButton* MakeNewTabButton();