Revert "Remove support for MSVC"

sky/engine/core/dom/ElementData.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2014 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 86 matching lines @@
     void destroy();
 #endif
 
     PassRefPtr<UniqueElementData> makeUniqueCopy() const;
 };
 
 #define DEFINE_ELEMENT_DATA_TYPE_CASTS(thisType,  pointerPredicate, referencePredicate) \
     template<typename T> inline thisType* to##thisType(const RefPtr<T>& data) { return to##thisType(data.get()); } \
     DEFINE_TYPE_CASTS(thisType, ElementData, data, pointerPredicate, referencePredicate)
 
+#if COMPILER(MSVC)
+#pragma warning(push)
+#pragma warning(disable: 4200) // Disable "zero-sized array in struct/union" warning
+#endif
+
 // SharableElementData is managed by ElementDataCache and is produced by
 // the parser during page load for elements that have identical attributes. This
 // is a memory optimization since it's very common for many elements to have
 // duplicate sets of attributes (ex. the same classes).
 class ShareableElementData final : public ElementData {
 public:
     static PassRefPtr<ShareableElementData> createWithAttributes(const Vector<Attribute>&);
 
     explicit ShareableElementData(const Vector<Attribute>&);
     explicit ShareableElementData(const UniqueElementData&);
@@ skipping 11 matching lines @@
         return location;
     }
 
     AttributeCollection attributes() const;
 
     Attribute m_attributeArray[0];
 };
 
 DEFINE_ELEMENT_DATA_TYPE_CASTS(ShareableElementData, !data->isUnique(), !data.isUnique());
 
+#if COMPILER(MSVC)
+#pragma warning(pop)
+#endif
+
 // UniqueElementData is created when an element needs to mutate its attributes
 // or gains presentation attribute style (ex. width="10"). It does not need to
 // be created to fill in values in the ElementData that are derived from
 // attributes. For example populating the m_inlineStyle from the style attribute
 // doesn't require a UniqueElementData as all elements with the same style
 // attribute will have the same inline style.
 class UniqueElementData final : public ElementData {
 public:
     static PassRefPtr<UniqueElementData> create();
     PassRefPtr<ShareableElementData> makeShareableCopy() const;
@@ skipping 39 matching lines @@
 }
 
 inline MutableAttributeCollection UniqueElementData::attributes()
 {
     return MutableAttributeCollection(m_attributeVector);
 }
 
 } // namespace blink
 
 #endif // ElementData_h