Use output parameter to distinguish error from absent result

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index e484e3d0563e04bc639b18f816f0c2773dea1f56..2ba840bef4f88f07e2590617ef328225e61b4ff4 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1941,8 +1941,11 @@ class JSObject: public JSReceiver {
       Handle<JSObject> object,
       Handle<AccessorInfo> info);
 
+  // The result must be checked first for exceptions. If there's no exception,
+  // the output parameter |done| indicates whether the interceptor has a result
+  // or not.
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithInterceptor(
-      LookupIterator* it);
+      LookupIterator* it, bool* done);
 
   // Accessors for hidden properties object.
   //