Add a fast path for tab strip expose.

chrome/browser/gtk/tabs/tab_strip_gtk.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 #define CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 
 #include <gtk/gtk.h>
 #include <vector>
 
@@ skipping 233 matching lines @@
                                      gint x, gint y, GtkSelectionData* data,
                                      guint info, guint time,
                                      TabStripGtk* tabstrip);
 
   // Handles the clicked signal from the new tab button.
   static void OnNewTabClicked(GtkWidget* widget, TabStripGtk* tabstrip);
 
   // 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();
 
   // Gets the number of Tabs in the collection.
   int GetTabCount() const;
 
   // Returns the number of pinned tabs.
   int GetPinnedTabCount() const;
 
   // Retrieves the Tab at the specified index.
@@ skipping 161 matching lines @@
   // ResizeLayoutTabsNow method.
   ScopedRunnableMethodFactory<TabStripGtk> resize_layout_factory_;
 
   // True if the tabstrip has already been added as a MessageLoop observer.
   bool added_as_message_loop_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStripGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_