mash: wires up shadows for mash

ui/views/widget/native_widget_aura.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_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 39 matching lines @@
   // associate |native_widget| with |window|.
   static void RegisterNativeWidgetForWindow(
       internal::NativeWidgetPrivate* native_widget,
       aura::Window* window);
 
   // Assign an icon to aura window.
   static void AssignIconToAuraWindow(aura::Window* window,
                                      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;
   NonClientFrameView* CreateNonClientFrameView() override;
   bool ShouldUseNativeFrame() const override;
   bool ShouldWindowContentsBeTransparent() const override;
   void FrameTypeChanged() override;
   Widget* GetWidget() override;
   const Widget* GetWidget() const override;
   gfx::NativeView GetNativeView() const override;
@@ skipping 166 matching lines @@
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_