Use the regular start incremental marking strategy in the idle notification.

src/heap/gc-idle-time-handler.h

Index: src/heap/gc-idle-time-handler.h
diff --git a/src/heap/gc-idle-time-handler.h b/src/heap/gc-idle-time-handler.h
index 899f289e22c0a265025d89e7ff54b1912b7c48dd..2d557df8a87ee45f18725c2f5891b33fbdccb402 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -110,6 +110,9 @@ class GCIdleTimeHandler {
   // step.
   static const size_t kSmallHeapSize = 2 * kPointerSize * MB;
 
+  // That is the maximum idle time we will have during frame rendering.
+  static const size_t kMaxFrameRenderingIdleTime = 16;
+
   struct HeapState {
     int contexts_disposed;
     size_t size_of_objects;