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

ui/wm/core/shadow_types.h

Index: ui/wm/core/shadow_types.h
diff --git a/ui/wm/core/shadow_types.h b/ui/wm/core/shadow_types.h
index 1198a43b16c72c84abd56a86d30fdf6e90e5d0b1..8de25e83024734f2fbe7fcbf6528bff8ef9ec192 100644
--- a/ui/wm/core/shadow_types.h
+++ b/ui/wm/core/shadow_types.h
@@ -15,19 +15,22 @@ class Window;
 namespace wm {
 
 // Different types of drop shadows that can be drawn under a window by the
-// shell.  Used as a value for the kShadowTypeKey property.
-enum ShadowType {
-  // Starts at 0 due to the cast in GetShadowType().
-  SHADOW_TYPE_NONE = 0,
-  SHADOW_TYPE_RECTANGULAR,
+// shell. Used as a value for the kShadowTypeKey property. The integer value of
+// each entry is directly used for determining the size of the shadow.
+enum class ShadowElevation {
+  NONE = 0,
+  SMALL = 6,
+  MEDIUM = 8,
+  LARGE = 24,
 };
 
-WM_EXPORT void SetShadowType(aura::Window* window, ShadowType shadow_type);
-WM_EXPORT ShadowType GetShadowType(aura::Window* window);
+WM_EXPORT void SetShadowElevation(aura::Window* window,
+                                  ShadowElevation shadow_type);
+WM_EXPORT ShadowElevation GetShadowElevation(aura::Window* window);
 
 // A property key describing the drop shadow that should be displayed under the
 // window.  If unset, no shadow is displayed.
-extern const aura::WindowProperty<ShadowType>* const kShadowTypeKey;
+extern const aura::WindowProperty<ShadowElevation>* const kShadowElevationKey;
 
 }  // namespace wm