Verify that a new heap page isn't also marked as being off heap.

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

Index: third_party/WebKit/Source/platform/heap/ThreadState.cpp
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.cpp b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
index 9b8d80983accd0a8337e0385f4868bad1b82df09..49262d07e9830a92fb1508ea15de3cd6252620a6 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.cpp
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
@@ -1084,6 +1084,15 @@ BasePage* ThreadState::findPageFromAddress(Address address) {
   }
   return nullptr;
 }
+
+bool ThreadState::isAddressInHeapDoesNotContainCache(Address address) {
+  // If the cache has been marked as invalidated, it's cleared prior
+  // to performing the next GC. Hence, consider the cache as being
+  // effectively empty.
+  if (m_shouldFlushHeapDoesNotContainCache)
+    return false;
+  return heap().m_heapDoesNotContainCache->lookup(address);
+}
 #endif
 
 size_t ThreadState::objectPayloadSizeForTesting() {