Fixes bug where client area would not get set correctly

ui/views/widget/native_widget_private.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 
 #include "base/strings/string16.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 56 matching lines @@
                                  gfx::NativeView new_parent);
 
   // Returns true if any mouse button is currently down.
   static bool IsMouseButtonDown();
 
   static gfx::FontList GetWindowTitleFontList();
 
   // 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;
 
   virtual bool ShouldUseNativeFrame() const = 0;
   virtual bool ShouldWindowContentsBeTransparent() const = 0;
   virtual void FrameTypeChanged() = 0;
 
   // Returns the Widget associated with this NativeWidget. This function is
   // guaranteed to return non-NULL for the lifetime of the NativeWidget.
@@ skipping 134 matching lines @@
   virtual void RepostNativeEvent(gfx::NativeEvent native_event) = 0;
 
   // Overridden from NativeWidget:
   internal::NativeWidgetPrivate* AsNativeWidgetPrivate() override;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_