[loggers] Guard object/code move events using mutexes.

src/heap-profiler.cc

Index: src/heap-profiler.cc
diff --git a/src/heap-profiler.cc b/src/heap-profiler.cc
index 6dc18f31841f9f3e9fcc81bfcb14e4b40b1def3a..ebf3d5629ebf83dbd9efb40b7f5a6ce79f88a28f 100644
--- a/src/heap-profiler.cc
+++ b/src/heap-profiler.cc
@@ -135,6 +135,7 @@ SnapshotObjectId HeapProfiler::GetSnapshotObjectId(Handle<Object> obj) {
 
 
 void HeapProfiler::ObjectMoveEvent(Address from, Address to, int size) {
+  base::LockGuard<base::Mutex> guard(&profiler_mutex_);
   bool known_object = ids_->MoveObject(from, to, size);
   if (!known_object && !allocation_tracker_.is_empty()) {
     allocation_tracker_->address_to_trace()->MoveObject(from, to, size);