Add a new resizer corner overlay.

chrome/browser/browser.h

Index: chrome/browser/browser.h
===================================================================
--- chrome/browser/browser.h	(revision 9328)
+++ chrome/browser/browser.h	(working copy)
@@ -391,8 +391,9 @@
   virtual void ContentsStateChanged(TabContents* source);
   virtual bool ShouldDisplayURLField();
   virtual void BeforeUnloadFired(TabContents* source,
-                                 bool proceed, 
+                                 bool proceed,
                                  bool* proceed_to_fire_unload);
+  virtual gfx::Rect GetRootWindowResizerRect() const;
   virtual void ShowHtmlDialog(HtmlDialogContentsDelegate* delegate,
                               void* parent_window);
   virtual void SetFocusToLocationBar();
@@ -490,7 +491,7 @@
   bool RemoveFromSet(UnloadListenerSet* set, TabContents* tab);
 
   // Cleans up state appropriately when we are trying to close the browser and
-  // the tab has finished firing it's unload handler. We also use this in the 
+  // the tab has finished firing it's unload handler. We also use this in the
   // cases where a tab crashes or hangs even if the beforeunload/unload haven't
   // successfully fired.
   void ClearUnloadState(TabContents* tab);