Unsampling for the sampling heap profiler

src/profiler/sampling-heap-profiler.h

Index: src/profiler/sampling-heap-profiler.h
diff --git a/src/profiler/sampling-heap-profiler.h b/src/profiler/sampling-heap-profiler.h
index 9aee282c8aff3da185df0aaea3b732989ab92cdf..522db67c9b46e3f476854c52361ef099d76d72e2 100644
--- a/src/profiler/sampling-heap-profiler.h
+++ b/src/profiler/sampling-heap-profiler.h
@@ -111,6 +111,7 @@ class SamplingHeapProfiler {
   v8::AllocationProfile::Node* TranslateAllocationNode(
       AllocationProfile* profile, SamplingHeapProfiler::AllocationNode* node,
       const std::map<int, Script*>& scripts);
+  v8::AllocationProfile::Allocation Unsample(size_t size, unsigned int count);
   AllocationNode* AddStack();
   AllocationNode* FindOrAddChildNode(AllocationNode* parent, const char* name,
                                      int script_id, int start_position);
@@ -123,6 +124,7 @@ class SamplingHeapProfiler {
   AllocationNode profile_root_;
   std::set<Sample*> samples_;
   const int stack_depth_;
+  const uint64_t rate_;
 
   friend class SamplingAllocationObserver;
 };