[heap] Add VMState to IncrementalMarking observer

src/heap/incremental-marking.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_INCREMENTAL_MARKING_H_
 #define V8_HEAP_INCREMENTAL_MARKING_H_
 
 #include "src/cancelable-task.h"
 #include "src/execution.h"
 #include "src/heap/heap.h"
@@ skipping 244 matching lines @@
     marking_deque_ = marking_deque;
   }
 
  private:
   class Observer : public AllocationObserver {
    public:
     Observer(IncrementalMarking& incremental_marking, intptr_t step_size)
         : AllocationObserver(step_size),
           incremental_marking_(incremental_marking) {}
 
-    void Step(int bytes_allocated, Address, size_t) override {
-      incremental_marking_.AdvanceIncrementalMarkingOnAllocation();
-    }
+    void Step(int bytes_allocated, Address, size_t) override;
 
    private:
     IncrementalMarking& incremental_marking_;
   };
 
   int64_t SpaceLeftInOldSpace();
 
   void StartMarking();
 
   void StartBlackAllocation();
@@ skipping 61 matching lines @@
 
   Observer new_generation_observer_;
   Observer old_generation_observer_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_INCREMENTAL_MARKING_H_