Replace WM shadow types (on/off) and styles (small/inactive/active)

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index aa89478dd50604acafdad03b842dbdbdafbaaa52..4dd01de50755d7d6ad65c76b691653dc6a11a716 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -232,6 +232,9 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     Ownership ownership;
     bool mirror_origin_in_rtl;
     ShadowType shadow_type;
+    // A hint about the size of the shadow if the type is SHADOW_TYPE_DROP. May
+    // be ignored on some platforms. A value <0 indicates no preference.
+    int shadow_elevation;

[Evan Stade, 2016/12/21 16:57:57]

Do you think the type for this param should be ui::ShadowElevation?

[sky, 2017/01/03 22:35:38]

Yes. Additionally do we need both shadow_type and shadow_elevation?

[Evan Stade, 2017/01/04 00:20:45]

Done.
I believe we do because of the way ShadowType is used in MenuHost::InitMenuHost.
We want to be able to control whether there is a shadow (ignoring platform
default), but to leave the elevation as the default.

     // Specifies that the system default caption and icon should not be
     // rendered, and that the client area should be equivalent to the window
     // area. Only used on some platforms (Windows and Linux).