Add a new resizer corner overlay.

chrome/browser/renderer_host/render_view_host_delegate.h

Index: chrome/browser/renderer_host/render_view_host_delegate.h
===================================================================
--- chrome/browser/renderer_host/render_view_host_delegate.h	(revision 9328)
+++ chrome/browser/renderer_host/render_view_host_delegate.h	(working copy)
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
+#include "base/gfx/rect.h"
 #include "base/logging.h"
 #include "net/base/load_states.h"
 #include "webkit/glue/password_form.h"
@@ -38,10 +39,6 @@
 class Message;
 }
 
-namespace gfx {
-class Rect;
-}
-
 namespace webkit_glue {
 struct WebApplicationInfo;
 }
@@ -301,13 +298,13 @@
   // Forms fillable by autofill have been detected in the page.
   virtual void AutofillFormSubmitted(const AutofillForm& form) { }
 
-  // Called to retrieve a list of suggestions from the web database given 
+  // Called to retrieve a list of suggestions from the web database given
   // the name of the field |field_name| and what the user has already typed in
   // the field |user_text|.  Appeals to the database thead to perform the query.
   // When the database thread is finished, the autofill manager retrieves the
   // calling RenderViewHost and then passes the vector of suggestions to
   // RenderViewHost::AutofillSuggestionsReturned.
-  virtual void GetAutofillSuggestions(const std::wstring& field_name, 
+  virtual void GetAutofillSuggestions(const std::wstring& field_name,
                                       const std::wstring& user_text,
                                       int64 node_id,
                                       int request_id) { }
@@ -372,9 +369,13 @@
   // blurred.
   virtual bool CanBlur() const { return true; }
 
+  // Return the rect where to display the resize corner, if any, otherwise
+  // an empty rect.
+  virtual gfx::Rect GetRootWindowResizerRect() const { return gfx::Rect(); }
+
   // Notification that the renderer has become unresponsive. The
   // delegate can use this notification to show a warning to the user.
-  virtual void RendererUnresponsive(RenderViewHost* render_view_host, 
+  virtual void RendererUnresponsive(RenderViewHost* render_view_host,
                                     bool is_during_unload) { }
 
   // Notification that a previously unresponsive renderer has become