Grow heap slowly after running memory reducer.

src/heap/memory-reducer.h

 // Copyright 2015 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_memory_reducer_H
 #define V8_HEAP_memory_reducer_H
 
 #include "include/v8-platform.h"
 #include "src/base/macros.h"
 #include "src/cancelable-task.h"
@@ skipping 112 matching lines @@
   // Posts a timer task that will call NotifyTimer after the given delay.
   void ScheduleTimer(double delay_ms);
   void TearDown();
   static const int kLongDelayMs;
   static const int kShortDelayMs;
   static const int kWatchdogDelayMs;
   static const int kMaxNumberOfGCs;
 
   Heap* heap() { return heap_; }
 
+  bool ShouldGrowHeapSlowly() {
+    return state_.action == kDone && state_.started_gcs > 0;
+  }
+
  private:
   class TimerTask : public v8::internal::CancelableTask {
    public:
     explicit TimerTask(MemoryReducer* memory_reducer);
 
    private:
     // v8::internal::CancelableTask overrides.
     void RunInternal() override;
     MemoryReducer* memory_reducer_;
     DISALLOW_COPY_AND_ASSIGN(TimerTask);
   };
 
   void NotifyTimer(const Event& event);
 
   static bool WatchdogGC(const State& state, const Event& event);
 
   Heap* heap_;
   State state_;
   DISALLOW_COPY_AND_ASSIGN(MemoryReducer);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_memory_reducer_H