Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/platform/heap/Visitor.cpp

Index: third_party/WebKit/Source/platform/heap/Visitor.cpp
diff --git a/third_party/WebKit/Source/platform/heap/Visitor.cpp b/third_party/WebKit/Source/platform/heap/Visitor.cpp
index 575285dae0c896bfdf62befc8351adbe3fc429ae..0db1e886179b346f94c6569d8bf4ba034d14f33a 100644
--- a/third_party/WebKit/Source/platform/heap/Visitor.cpp
+++ b/third_party/WebKit/Source/platform/heap/Visitor.cpp
@@ -22,16 +22,16 @@ VisitorScope::VisitorScope(ThreadState* state, BlinkGC::GCType gcType)
     switch (gcType) {
     case BlinkGC::GCWithSweep:
     case BlinkGC::GCWithoutSweep:
-        m_visitor = adoptPtr(new MarkingVisitor<Visitor::GlobalMarking>());
+        m_visitor = adoptPtr(new MarkingVisitor<Visitor::GlobalMarking>(this));
         break;
     case BlinkGC::TakeSnapshot:
-        m_visitor = adoptPtr(new MarkingVisitor<Visitor::SnapshotMarking>());
+        m_visitor = adoptPtr(new MarkingVisitor<Visitor::SnapshotMarking>(this));
         break;
     case BlinkGC::ThreadTerminationGC:
-        m_visitor = adoptPtr(new MarkingVisitor<Visitor::ThreadLocalMarking>());
+        m_visitor = adoptPtr(new MarkingVisitor<Visitor::ThreadLocalMarking>(this));
         break;
     case BlinkGC::ThreadLocalWeakProcessing:
-        m_visitor = adoptPtr(new MarkingVisitor<Visitor::WeakProcessing>());
+        m_visitor = adoptPtr(new MarkingVisitor<Visitor::WeakProcessing>(this));
         break;
     default:
         ASSERT_NOT_REACHED();