Re-reland Propagate OnNativeWidgetMove to delegate/observers, etc.

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index 8f1baca538ae88c6e9b8915a4ff6b87ac42eb523..c2f4eb44699d06cb9e6cc293b6ee1098092f45ac 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -98,6 +98,7 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     virtual void OnWidgetClosing(Widget* widget) {}
     virtual void OnWidgetVisibilityChanged(Widget* widget, bool visible) {}
     virtual void OnWidgetActivationChanged(Widget* widget, bool active) {}
+    virtual void OnWidgetMoved(Widget* widget) {}
   };
 
   typedef std::set<Widget*> Widgets;
@@ -620,6 +621,7 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   virtual void OnNativeWidgetDestroyed() OVERRIDE;
   virtual gfx::Size GetMinimumSize() OVERRIDE;
   virtual gfx::Size GetMaximumSize() OVERRIDE;
+  virtual void OnNativeWidgetMove() OVERRIDE;
   virtual void OnNativeWidgetSizeChanged(const gfx::Size& new_size) OVERRIDE;
   virtual void OnNativeWidgetBeginUserBoundsChange() OVERRIDE;
   virtual void OnNativeWidgetEndUserBoundsChange() OVERRIDE;