Widget::ShouldUseNativeFrame is now meaningful on Linux.

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 62 matching lines @@
   static bool IsTouchDown();
 
   // Initializes the NativeWidget.
   virtual void InitNativeWidget(const Widget::InitParams& params) = 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.
   virtual Widget* GetWidget() = 0;
   virtual const Widget* GetWidget() const = 0;
 
   // Returns the NativeView/Window associated with this NativeWidget.
   virtual gfx::NativeView GetNativeView() const = 0;
   virtual gfx::NativeWindow GetNativeWindow() const = 0;
@@ skipping 127 matching lines @@
 
   // Overridden from NativeWidget:
   virtual internal::NativeWidgetPrivate* AsNativeWidgetPrivate() OVERRIDE;
   virtual ui::EventHandler* GetEventHandler() = 0;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_