Oilpan: make DataObject and SharedWorker heap Supplementables.

Source/modules/performance/SharedWorkerPerformance.h

Index: Source/modules/performance/SharedWorkerPerformance.h
diff --git a/Source/modules/performance/SharedWorkerPerformance.h b/Source/modules/performance/SharedWorkerPerformance.h
index 2bd6caf6c5eb859512527d4f89c598821e0a8b82..c4d3a94a1c9e8b84177401afb091deda111147a0 100644
--- a/Source/modules/performance/SharedWorkerPerformance.h
+++ b/Source/modules/performance/SharedWorkerPerformance.h
@@ -30,6 +30,7 @@
 #ifndef SharedWorkerPerformance_h
 #define SharedWorkerPerformance_h
 
+#include "heap/Handle.h"
 #include "platform/Supplementable.h"
 
 namespace WebCore {
@@ -37,7 +38,8 @@ namespace WebCore {
 class ExecutionContext;
 class SharedWorker;
 
-class SharedWorkerPerformance FINAL : public Supplement<SharedWorker> {
+class SharedWorkerPerformance FINAL : public NoBaseWillBeGarbageCollected<SharedWorkerPerformance>, public WillBeHeapSupplement<SharedWorker> {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SharedWorkerPerformance);
 public:
     virtual ~SharedWorkerPerformance();
     static SharedWorkerPerformance& from(SharedWorker&);
@@ -45,6 +47,8 @@ public:
     static double workerStart(ExecutionContext*, SharedWorker&);
     double getWorkerStart(ExecutionContext*, SharedWorker&) const;
 
+    void trace(Visitor*) { }
+
 private:
     explicit SharedWorkerPerformance();
     static const char* supplementName();