mash: wires up shadows for mash

ui/views/widget/native_widget_aura.h

Index: ui/views/widget/native_widget_aura.h
diff --git a/ui/views/widget/native_widget_aura.h b/ui/views/widget/native_widget_aura.h
index 7ec157a21e38c095b9cba9550abcecec85076e63..e46f003f84b941fb82ba3fd8bea48f4431214942 100644
--- a/ui/views/widget/native_widget_aura.h
+++ b/ui/views/widget/native_widget_aura.h
@@ -57,6 +57,11 @@ class VIEWS_EXPORT NativeWidgetAura
                                      const gfx::ImageSkia& window_icon,
                                      const gfx::ImageSkia& app_icon);
 
+  // If necessary, sets the ShadowElevation of |window| from |params|.
+  static void SetShadowElevationFromInitParams(
+      aura::Window* window,
+      const Widget::InitParams& params);
+
   // Overridden from internal::NativeWidgetPrivate:
   void InitNativeWidget(const Widget::InitParams& params) override;
   void OnWidgetInitDone() override;