Do inline object filtering (via page flags) before call to RecordWriteStub.

src/incremental-marking.h

Index: src/incremental-marking.h
diff --git a/src/incremental-marking.h b/src/incremental-marking.h
index 7bd99bf7dc0e324c63f4bfb5270b79bb1ed6a0db..41a220dfbde669f6fa38addfdda364c1668888b3 100644
--- a/src/incremental-marking.h
+++ b/src/incremental-marking.h
@@ -189,6 +189,15 @@ class IncrementalMarking : public AllStatic {
     return steps_took_;
   }
 
+  inline void SetOldSpacePageFlags(MemoryChunk* chunk) {
+    SetOldSpacePageFlags(chunk, IsMarking());
+  }
+
+  inline void SetNewSpacePageFlags(MemoryChunk* chunk) {
+    SetNewSpacePageFlags(chunk, IsMarking());
+  }
+
+
  private:
   void set_should_hurry(bool val) {
     should_hurry_ = val;
@@ -210,6 +219,11 @@ class IncrementalMarking : public AllStatic {
 
   void StartMarking();
 
+  void RevertWriteBarrierFlags(PagedSpace* space);
+  void RevertWriteBarrierFlags();
+
+  static void SetOldSpacePageFlags(MemoryChunk* chunk, bool is_marking);
+  static void SetNewSpacePageFlags(MemoryChunk* chunk, bool is_marking);
 
   Heap* heap_;