Views: Draw Textfield selected text in gray when top-level Widget loses focus.

ui/views/focus/focus_manager.h

Index: ui/views/focus/focus_manager.h
diff --git a/ui/views/focus/focus_manager.h b/ui/views/focus/focus_manager.h
index 99ca6e6772662baf0446feffbe3bf6e705ba6e19..c28db812948731f3721814588f2d7871913212dd 100644
--- a/ui/views/focus/focus_manager.h
+++ b/ui/views/focus/focus_manager.h
@@ -119,6 +119,8 @@ class VIEWS_EXPORT FocusChangeListener {
   // Called after focus state has changed.
   virtual void OnDidChangeFocus(View* focused_before, View* focused_now) = 0;
 
+  virtual void OnFocusManagerDestroying() {}
+
  protected:
   virtual ~FocusChangeListener() {}
 };