Use a new type of weak phantom handle for ScriptWrappable.

third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp b/third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp
index 70a0efcae5fb2130c03c28d68a31aadf140f9c04..73b57f63035d2ea18c60367add2ce0f400684309 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp
@@ -315,8 +315,21 @@ void V8GCController::gcPrologue(v8::Isolate* isolate, v8::GCType type, v8::GCCal
     }
 }
 
+namespace {
+
+    void UpdateCollectedPhantomHandles(v8::Isolate* isolate)

[haraken, 2016/05/04 14:10:34]

Nit: No indentation.

[ulan, 2016/05/04 14:17:02]

Done.

+    {
+        ThreadHeapStats& heapStats = ThreadState::current()->heap().heapStats();
+        size_t count = isolate->NumberOfPhantomHandleResetsSinceLastCall();
+        heapStats.decreaseWrapperCount(count);
+        heapStats.increaseCollectedWrapperCount(count);
+    }
+
+} // namespace
+
 void V8GCController::gcEpilogue(v8::Isolate* isolate, v8::GCType type, v8::GCCallbackFlags flags)
 {
+    UpdateCollectedPhantomHandles(isolate);
     switch (type) {
     case v8::kGCTypeScavenge:
         TRACE_EVENT_END1("devtools.timeline,v8", "MinorGC", "usedHeapSizeAfter", usedHeapSize(isolate));