Fix HEAP_PROFILE_MMAP in google-perftools.

third_party/tcmalloc/chromium/src/heap-profiler.cc

Index: third_party/tcmalloc/chromium/src/heap-profiler.cc
diff --git a/third_party/tcmalloc/chromium/src/heap-profiler.cc b/third_party/tcmalloc/chromium/src/heap-profiler.cc
index 6b1ae524ebc3ce69f92cdb0b03cc9e493ac471f4..6e7172283874b5e1d0cf065256f625231518105a 100644
--- a/third_party/tcmalloc/chromium/src/heap-profiler.cc
+++ b/third_party/tcmalloc/chromium/src/heap-profiler.cc
@@ -190,6 +190,7 @@ static void AddRemoveMMapDataLocked(AddOrRemove mode) {
   // MemoryRegionMap maintained all the data we need for all
   // mmap-like allocations, so we just use it here:
   MemoryRegionMap::LockHolder l;
+  heap_profile->MMapRecordBegin();
   for (MemoryRegionMap::RegionIterator r = MemoryRegionMap::BeginRegionLocked();
        r != MemoryRegionMap::EndRegionLocked(); ++r) {
     if (mode == ADD) {
@@ -201,6 +202,7 @@ static void AddRemoveMMapDataLocked(AddOrRemove mode) {
       heap_profile->RecordFree(reinterpret_cast<void*>(r->start_addr));
     }
   }
+  heap_profile->MMapRecordEnd();
 }
 
 // Input must be a buffer of size at least 1MB.