Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.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.
  *
@@ skipping 52 matching lines @@
     static bool traceInCollection(VisitorDispatcher visitor, Member<CachedMatchedProperties>& cachedProperties, WTF::ShouldWeakPointersBeMarkedStrongly strongify)
     {
         // Only honor the cache's weakness semantics if the collection is traced
         // with WeakPointersActWeak. Otherwise just trace the cachedProperties
         // strongly, ie. call trace on it.
         if (cachedProperties && strongify == WTF::WeakPointersActWeak) {
             // A given cache entry is only kept alive if none of the MatchedProperties
             // in the CachedMatchedProperties value contain a dead "properties" field.
             // If there is a dead field the entire cache entry is removed.
             for (const auto& matchedProperties : cachedProperties->matchedProperties) {
-                if (!Heap::isHeapObjectAlive(matchedProperties.properties)) {
+                if (!ThreadHeap::isHeapObjectAlive(matchedProperties.properties)) {
                     // For now report the cache entry as dead. This might not
                     // be the final result if in a subsequent call for this entry,
                     // the "properties" field has been marked via another path.
                     return true;
                 }
             }
         }
         // At this point none of the entries in the matchedProperties vector
         // had a dead "properties" field so trace CachedMatchedProperties strongly.
         // FIXME: traceInCollection is also called from WeakProcessing to check if the entry is dead.
         // Avoid calling trace in that case by only calling trace when cachedProperties is not yet marked.
-        if (!Heap::isHeapObjectAlive(cachedProperties))
+        if (!ThreadHeap::isHeapObjectAlive(cachedProperties))
             visitor->trace(cachedProperties);
         return false;
     }
 };
 #endif
 
 class MatchedPropertiesCache {
     DISALLOW_NEW();
     WTF_MAKE_NONCOPYABLE(MatchedPropertiesCache);
 public:
@@ skipping 25 matching lines @@
 
     using Cache = HashMap<unsigned, OwnPtr<CachedMatchedProperties>>;
     Timer<MatchedPropertiesCache> m_sweepTimer;
 #endif
     Cache m_cache;
 };
 
 } // namespace blink
 
 #endif