Make StyleRareNonInheritedData::draggable_regions a bit field.

third_party/WebKit/Source/core/style/ComputedStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1510 matching lines @@
 
   // zoom
   static float InitialZoom() { return 1.0f; }
   float Zoom() const { return ZoomInternal(); }
   float EffectiveZoom() const { return rare_inherited_data_->effective_zoom_; }
   bool SetZoom(float);
   bool SetEffectiveZoom(float);
 
   // -webkit-app-region
   DraggableRegionMode GetDraggableRegionMode() const {
-    return rare_non_inherited_data_->draggable_region_mode_;
+    return static_cast<DraggableRegionMode>(
+        rare_non_inherited_data_->draggable_region_mode_);
   }
   void SetDraggableRegionMode(DraggableRegionMode v) {
-    SET_VAR(rare_non_inherited_data_, draggable_region_mode_, v);
+    SET_VAR(rare_non_inherited_data_, draggable_region_mode_,
+            static_cast<unsigned>(v));
   }
 
   // -webkit-appearance
   static ControlPart InitialAppearance() { return kNoControlPart; }
   ControlPart Appearance() const {
     return static_cast<ControlPart>(rare_non_inherited_data_->appearance_);
   }
   void SetAppearance(ControlPart a) {
     SET_VAR(rare_non_inherited_data_, appearance_, a);
   }
@@ skipping 2206 matching lines @@
       PseudoBitsInternal() | 1 << (pseudo - kFirstPublicPseudoId)));
 }
 
 inline bool ComputedStyle::HasPseudoElementStyle() const {
   return PseudoBitsInternal() & kElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h