Oilpan: Count # of collected Persistent handles and use it to estimate the live object size

Source/bindings/core/v8/WrapperTypeInfo.h

Index: Source/bindings/core/v8/WrapperTypeInfo.h
diff --git a/Source/bindings/core/v8/WrapperTypeInfo.h b/Source/bindings/core/v8/WrapperTypeInfo.h
index d2d8c76548a1da9ce6d67efcaef09267c5a54117..ee3b098ce79bf9d33be3b1c733619a78cfead8e2 100644
--- a/Source/bindings/core/v8/WrapperTypeInfo.h
+++ b/Source/bindings/core/v8/WrapperTypeInfo.h
@@ -126,12 +126,26 @@ struct WrapperTypeInfo {
 
     void refObject(ScriptWrappable* scriptWrappable) const
     {
+        if (gcType == GarbageCollectedObject) {
+            ThreadState::current()->persistentAllocated();
+        } else if (gcType == WillBeGarbageCollectedObject) {
+#if ENABLE(OILPAN)
+            ThreadState::current()->persistentAllocated();
+#endif
+        }
         ASSERT(refObjectFunction);
         refObjectFunction(scriptWrappable);
     }
 
     void derefObject(ScriptWrappable* scriptWrappable) const
     {
+        if (gcType == GarbageCollectedObject) {
+            ThreadState::current()->persistentFreed();
+        } else if (gcType == WillBeGarbageCollectedObject) {
+#if ENABLE(OILPAN)
+            ThreadState::current()->persistentFreed();
+#endif
+        }
         ASSERT(derefObjectFunction);
         derefObjectFunction(scriptWrappable);
     }