Fixes bug where client area would not get set correctly

ui/views/widget/native_widget_private.h

Index: ui/views/widget/native_widget_private.h
diff --git a/ui/views/widget/native_widget_private.h b/ui/views/widget/native_widget_private.h
index 2adf5894c4f6bc09b10b500ec335af996c387994..6e52bf6674966b746383f8683c365fcb1dcea41d 100644
--- a/ui/views/widget/native_widget_private.h
+++ b/ui/views/widget/native_widget_private.h
@@ -74,6 +74,10 @@ class VIEWS_EXPORT NativeWidgetPrivate : public NativeWidget {
   // Initializes the NativeWidget.
   virtual void InitNativeWidget(const Widget::InitParams& params) = 0;
 
+  // Called at the end of Widget::Init(), after Widget has completed
+  // initialization.
+  virtual void OnWidgetInitDone() = 0;
+
   // Returns a NonClientFrameView for the widget's NonClientView, or NULL if
   // the NativeWidget wants no special NonClientFrameView.
   virtual NonClientFrameView* CreateNonClientFrameView() = 0;