[Oilpan]: Make StylePropertySet fully garbage collected.

Source/core/css/resolver/MatchedPropertiesCache.cpp

Index: Source/core/css/resolver/MatchedPropertiesCache.cpp
diff --git a/Source/core/css/resolver/MatchedPropertiesCache.cpp b/Source/core/css/resolver/MatchedPropertiesCache.cpp
index 469fa3c9c2fb3b0fc99395faa735e8ff61adf3db..e629a2e05d346eec6ea77b30710dff68b2a90a8f 100644
--- a/Source/core/css/resolver/MatchedPropertiesCache.cpp
+++ b/Source/core/css/resolver/MatchedPropertiesCache.cpp
@@ -54,8 +54,10 @@ void CachedMatchedProperties::clear()
 }
 
 MatchedPropertiesCache::MatchedPropertiesCache()
+#if !ENABLE(OILPAN)
     : m_additionsSinceLastSweep(0)
     , m_sweepTimer(this, &MatchedPropertiesCache::sweep)
+#endif
 {
 }
 
@@ -85,17 +87,19 @@ const CachedMatchedProperties* MatchedPropertiesCache::find(unsigned hash, const
 
 void MatchedPropertiesCache::add(const RenderStyle* style, const RenderStyle* parentStyle, unsigned hash, const MatchResult& matchResult)
 {
+#if !ENABLE(OILPAN)
     static const unsigned maxAdditionsBetweenSweeps = 100;
     if (++m_additionsSinceLastSweep >= maxAdditionsBetweenSweeps
         && !m_sweepTimer.isActive()) {
         static const unsigned sweepTimeInSeconds = 60;
         m_sweepTimer.startOneShot(sweepTimeInSeconds, FROM_HERE);
     }
+#endif
 
     ASSERT(hash);
     Cache::AddResult addResult = m_cache.add(hash, nullptr);
     if (addResult.isNewEntry)
-        addResult.storedValue->value = adoptPtr(new CachedMatchedProperties);
+        addResult.storedValue->value = adoptPtrWillBeNoop(new CachedMatchedProperties);
 
     CachedMatchedProperties* cacheItem = addResult.storedValue->value.get();
     if (!addResult.isNewEntry)
@@ -111,7 +115,7 @@ void MatchedPropertiesCache::clear()
 
 void MatchedPropertiesCache::clearViewportDependent()
 {
-    Vector<unsigned, 16> toRemove;
+    WillBeHeapVector<unsigned, 16> toRemove;
     for (Cache::iterator it = m_cache.begin(); it != m_cache.end(); ++it) {
         CachedMatchedProperties* cacheItem = it->value.get();
         if (cacheItem->renderStyle->hasViewportUnits())
@@ -120,6 +124,7 @@ void MatchedPropertiesCache::clearViewportDependent()
     m_cache.removeAll(toRemove);
 }
 
+#if !ENABLE(OILPAN)
 void MatchedPropertiesCache::sweep(Timer<MatchedPropertiesCache>*)
 {
     // Look for cache entries containing a style declaration with a single ref and remove them.
@@ -141,6 +146,7 @@ void MatchedPropertiesCache::sweep(Timer<MatchedPropertiesCache>*)
     m_cache.removeAll(toRemove);
     m_additionsSinceLastSweep = 0;
 }
+#endif
 
 bool MatchedPropertiesCache::isCacheable(const Element* element, const RenderStyle* style, const RenderStyle* parentStyle)
 {
@@ -166,4 +172,9 @@ bool MatchedPropertiesCache::isCacheable(const Element* element, const RenderSty
     return true;
 }
 
+void MatchedPropertiesCache::trace(Visitor* visitor)
+{
+    visitor->trace(m_cache);
+}
+
 }