Reserve a dedicated arena for every construction of mmap_address_map.

third_party/tcmalloc/chromium/src/heap-profile-table.h

Index: third_party/tcmalloc/chromium/src/heap-profile-table.h
diff --git a/third_party/tcmalloc/chromium/src/heap-profile-table.h b/third_party/tcmalloc/chromium/src/heap-profile-table.h
index 447943dc7355315174d59a42e78a1e8f6b5a008a..27ebd6de1fee932756cbe8fef7eff264e1cbfead 100644
--- a/third_party/tcmalloc/chromium/src/heap-profile-table.h
+++ b/third_party/tcmalloc/chromium/src/heap-profile-table.h
@@ -190,12 +190,12 @@ class HeapProfileTable {
   // Refresh the internal mmap information from MemoryRegionMap.  Results of
   // FillOrderedProfile and IterateOrderedAllocContexts will contain mmap'ed
   // memory regions as at calling RefreshMMapData.
-  void RefreshMMapData();
+  void RefreshMMapData(Allocator mmap_alloc, DeAllocator mmap_dealloc);
 
   // Clear the internal mmap information.  Results of FillOrderedProfile and
   // IterateOrderedAllocContexts won't contain mmap'ed memory regions after
   // calling ClearMMapData.
-  void ClearMMapData();
+  void ClearMMapData(DeAllocator mmap_dealloc);
 
  private:
   friend class DeepHeapProfile;