[Oilpan]: Make StylePropertySet fully garbage collected.

Source/core/css/resolver/MatchResult.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef MatchResult_h
 #define MatchResult_h
 
 #include "core/css/RuleSet.h"
 #include "core/css/SelectorChecker.h"
+#include "platform/heap/Handle.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class StylePropertySet;
 class StyleRule;
 
 struct RuleRange {
     RuleRange(int& firstRuleIndex, int& lastRuleIndex): firstRuleIndex(firstRuleIndex), lastRuleIndex(lastRuleIndex) { }
     int& firstRuleIndex;
     int& lastRuleIndex;
 };
 
 struct MatchRanges {
     MatchRanges() : firstUARule(-1), lastUARule(-1), firstAuthorRule(-1), lastAuthorRule(-1), firstUserRule(-1), lastUserRule(-1) { }
     int firstUARule;
     int lastUARule;
     int firstAuthorRule;
     int lastAuthorRule;
     int firstUserRule;
     int lastUserRule;
     RuleRange UARuleRange() { return RuleRange(firstUARule, lastUARule); }
     RuleRange authorRuleRange() { return RuleRange(firstAuthorRule, lastAuthorRule); }
     RuleRange userRuleRange() { return RuleRange(firstUserRule, lastUserRule); }
 };
 
 struct MatchedProperties {
+    ALLOW_ONLY_INLINE_ALLOCATION();
+public:
     MatchedProperties();
     ~MatchedProperties();
 
+    void trace(Visitor*);
+
+#if ENABLE(OILPAN)
+    WeakMember<StylePropertySet> properties;
+#else
     RefPtr<StylePropertySet> properties;
+#endif
+
     union {
         struct {
             unsigned linkMatchType : 2;
             unsigned whitelistType : 2;
         };
         // Used to make sure all memory is zero-initialized since we compute the hash over the bytes of this object.
         void* possiblyPaddedMember;
     };
 };
 
+} // WebCore namespace
+
+namespace WTF {
+template <> struct VectorTraits<WebCore::MatchedProperties> : VectorTraitsBase<WebCore::MatchedProperties> {
+    static const bool canInitializeWithMemset = true;
+    static const bool canMoveWithMemcpy = true;
+};
+
+}
+
+namespace WebCore {
+
 class MatchResult {
     STACK_ALLOCATED();
 public:
     MatchResult() : isCacheable(true) { }
-    Vector<MatchedProperties, 64> matchedProperties;
+    WillBeHeapVector<MatchedProperties, 64> matchedProperties;
     WillBeHeapVector<RawPtrWillBeMember<StyleRule>, 64> matchedRules;
     MatchRanges ranges;
     bool isCacheable;
 
     void addMatchedProperties(const StylePropertySet* properties, StyleRule* = 0, unsigned linkMatchType = SelectorChecker::MatchAll, PropertyWhitelistType = PropertyWhitelistNone);
 };
 
 inline bool operator==(const MatchRanges& a, const MatchRanges& b)
 {
     return a.firstUARule == b.firstUARule
@@ skipping 15 matching lines @@
 }
 
 inline bool operator!=(const MatchedProperties& a, const MatchedProperties& b)
 {
     return !(a == b);
 }
 
 } // namespace WebCore
 
 #endif // MatchResult_h