Make sure ImmutableStylePropertySet uses the new 16 bits size of StylePropertyMetadata.

Source/core/css/StylePropertySet.cpp

Index: Source/core/css/StylePropertySet.cpp
diff --git a/Source/core/css/StylePropertySet.cpp b/Source/core/css/StylePropertySet.cpp
index c58aaa973909c3427734ff4fcddeb35bc357a0b6..c97360c6e4d656273493c32b94e68b9cd14fb3c0 100644
--- a/Source/core/css/StylePropertySet.cpp
+++ b/Source/core/css/StylePropertySet.cpp
@@ -2,6 +2,7 @@
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
+ * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -51,7 +52,7 @@ static PropertySetCSSOMWrapperMap& propertySetCSSOMWrapperMap()
 
 static size_t sizeForImmutableStylePropertySetWithPropertyCount(unsigned count)
 {
-    return sizeof(ImmutableStylePropertySet) - sizeof(void*) + sizeof(CSSValue*) * count + sizeof(StylePropertyMetadata) * count;
+    return sizeof(ImmutableStylePropertySet) - sizeof(void*) + sizeof(CSSValue*) * count + sizeof(uint16_t) * count;
 }
 
 PassRefPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::create(const CSSProperty* properties, unsigned count, CSSParserMode cssParserMode)
@@ -79,10 +80,11 @@ MutableStylePropertySet::MutableStylePropertySet(const CSSProperty* properties,
 ImmutableStylePropertySet::ImmutableStylePropertySet(const CSSProperty* properties, unsigned length, CSSParserMode cssParserMode)
     : StylePropertySet(cssParserMode, length)
 {
-    StylePropertyMetadata* metadataArray = const_cast<StylePropertyMetadata*>(this->metadataArray());
+    uint16_t* metadataArray = const_cast<uint16_t*>(this->metadataArray());
     CSSValue** valueArray = const_cast<CSSValue**>(this->valueArray());
     for (unsigned i = 0; i < length; ++i) {
-        metadataArray[i] = properties[i].metadata();
+        StylePropertyMetadata metadata = properties[i].metadata();
+        metadataArray[i] = *(reinterpret_cast<uint16_t*>(&metadata));

[Jeffrey Yasskin, 2013/06/21 19:56:27]

That reinterpret_cast is undefined behavior; use memcpy instead.

         valueArray[i] = properties[i].value();
         valueArray[i]->ref();
     }