Sampling heap profiler: Force Full GC before retrieving the profile.

src/profiler/heap-profiler.h

Index: src/profiler/heap-profiler.h
diff --git a/src/profiler/heap-profiler.h b/src/profiler/heap-profiler.h
index 32e143c74ff22ddbfce5dadd2823f5122fd64598..93cb57a7d1599888583bbf121a20f0b89aa00c4e 100644
--- a/src/profiler/heap-profiler.h
+++ b/src/profiler/heap-profiler.h
@@ -30,7 +30,8 @@ class HeapProfiler {
       v8::ActivityControl* control,
       v8::HeapProfiler::ObjectNameResolver* resolver);
 
-  bool StartSamplingHeapProfiler(uint64_t sample_interval, int stack_depth);
+  bool StartSamplingHeapProfiler(uint64_t sample_interval, int stack_depth,
+                                 v8::HeapProfiler::SamplingFlags);
   void StopSamplingHeapProfiler();
   bool is_sampling_allocations() { return !sampling_heap_profiler_.is_empty(); }
   AllocationProfile* GetAllocationProfile();