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..cf7f31318053af78dc8ba23b92839b882c962e3b 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|.

[msw, 2017/02/15 01:37:29]

optional nit: comma after necessary

[sky, 2017/02/15 03:58:25]

Done.

+  static void SetShadowElevationFromInitParams(

[msw, 2017/02/15 01:37:29]

Could this just be part of InitNativeWidget? (why isn't that used for
DesktopWindowTreeHostMus::Init? Are we missing any other aura window
initialization steps in that function?)

[sky, 2017/02/15 03:58:25]

It's not necessarily for NativeWidgetMac. I think we have most other parts of
NativeWidgetAura::InitNativeWidget, but I'll take a closer look separately.

+      aura::Window* window,
+      const Widget::InitParams& params);
+
   // Overridden from internal::NativeWidgetPrivate:
   void InitNativeWidget(const Widget::InitParams& params) override;
   void OnWidgetInitDone() override;