Handle titlebar text updates properly

ui/views/window/non_client_view.h

Index: ui/views/window/non_client_view.h
diff --git a/ui/views/window/non_client_view.h b/ui/views/window/non_client_view.h
index 3b6fd0b7c7574fc53ef9ccfd47662c039e335e8d..9658657f8452c39f01f51d420ceecfb898e37412 100644
--- a/ui/views/window/non_client_view.h
+++ b/ui/views/window/non_client_view.h
@@ -65,6 +65,7 @@ class VIEWS_EXPORT NonClientFrameView : public View {
                              gfx::Path* window_mask) = 0;
   virtual void ResetWindowControls() = 0;
   virtual void UpdateWindowIcon() = 0;
+  virtual void UpdateWindowTitle() = 0;
 
   // Overridden from View:
   virtual bool HitTestRect(const gfx::Rect& rect) const OVERRIDE;
@@ -184,6 +185,10 @@ class VIEWS_EXPORT NonClientView : public View {
   // Tells the NonClientView to invalidate the NonClientFrameView's window icon.
   void UpdateWindowIcon();
 
+  // Tells the NonClientView to invalidate the NonClientFrameView's window
+  // title.
+  void UpdateWindowTitle();
+
   // Get/Set client_view property.
   ClientView* client_view() const { return client_view_; }
   void set_client_view(ClientView* client_view) {