Disable collection backing reallocation during pre finalizer

third_party/WebKit/Source/platform/heap/HeapAllocator.h

Index: third_party/WebKit/Source/platform/heap/HeapAllocator.h
diff --git a/third_party/WebKit/Source/platform/heap/HeapAllocator.h b/third_party/WebKit/Source/platform/heap/HeapAllocator.h
index f52965b22cff122a5d648bfe3bbb2e57b75313e6..134422a3e04e5dbb887003a85baa8170f025c48b 100644
--- a/third_party/WebKit/Source/platform/heap/HeapAllocator.h
+++ b/third_party/WebKit/Source/platform/heap/HeapAllocator.h
@@ -151,6 +151,10 @@ class PLATFORM_EXPORT HeapAllocator {
     return ThreadState::Current()->IsAllocationAllowed();
   }
 
+  static bool IsBackingReallocationAllowed() {

[kouhei (in TOK), 2017/04/12 06:14:01]

Can we make it clear that this is inside prefinalizer so that we can use the
predicate in DCHECKs to assert certain methods are not called from prefinalizer.

[haraken, 2017/04/12 06:44:34]

Maybe we can rename this to IsObjectRessurectionForbidden.

I cannot come up with a better name...

[keishi, 2017/04/12 09:43:53]

Done.

+    return ThreadState::Current()->IsBackingReallocationAllowed();
+  }
+
   template <typename T>
   static bool IsHeapObjectAlive(T* object) {
     return ThreadHeap::IsHeapObjectAlive(object);