Refactor menu dependency on aura/wm SetShadowType

ui/views/widget/widget.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_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 162 matching lines @@
     enum Ownership {
       // Default. Creator is not responsible for managing the lifetime of the
       // Widget, it is destroyed when the corresponding NativeWidget is
       // destroyed.
       NATIVE_WIDGET_OWNS_WIDGET,
       // Used when the Widget is owned by someone other than the NativeWidget,
       // e.g. a scoped_ptr in tests.
       WIDGET_OWNS_NATIVE_WIDGET
     };
 
+    enum ShadowType {
+      DEFAULT_SHADOW,   // Use default shadow setting.

[sky, 2014/05/20 13:30:42]

SHADOW_TYPE_DEFAULT, SHADOW_TYPE_NONE, SHADOW_TYPE_DROP (this is the common
naming style as used by content and is preferable). Also, better document what
default means.

+      NO_SHADOW,        // Don't draw any shadow.
+      DROP_SHADOW,      // Draw a drop shadow that emphasizes Z-order
+                        // relationship to other windows.
+    };
+
     InitParams();
     explicit InitParams(Type type);
     ~InitParams();
 
     Type type;
     // If NULL, a default implementation will be constructed.
     WidgetDelegate* delegate;
     bool child;
     // If TRANSLUCENT_WINDOW, the widget may be fully or partially transparent.
     // If OPAQUE_WINDOW, we can perform optimizations based on the widget being
     // fully opaque.  Defaults to TRANSLUCENT_WINDOW if
     // ViewsDelegate::UseTransparentWindows().  Defaults to OPAQUE_WINDOW for
     // non-window widgets.
     WindowOpacity opacity;
     bool accept_events;
     Activatable activatable;
     bool keep_on_top;
     bool visible_on_all_workspaces;
     Ownership ownership;
     bool mirror_origin_in_rtl;
-    bool has_dropshadow;
+    ShadowType shadow_type;
     // 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).
     bool remove_standard_frame;
     // Only used by ShellWindow on Windows. Specifies that the default icon of
     // packaged app should be the system default icon.
     bool use_system_default_icon;
     // Whether the widget should be maximized or minimized.
     ui::WindowShowState show_state;
     // Should the widget be double buffered? Default is false.
@@ skipping 716 matching lines @@
   bool movement_disabled_;
 
   ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_