DMP: Fix the number of buckets.

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

Index: third_party/tcmalloc/chromium/src/heap-profile-table.cc
diff --git a/third_party/tcmalloc/chromium/src/heap-profile-table.cc b/third_party/tcmalloc/chromium/src/heap-profile-table.cc
index 6d75c4a49a861320dd2eb500e9a23058ef54fd07..893fd4e98a26e365d77fab4dd4460698513c93c8 100644
--- a/third_party/tcmalloc/chromium/src/heap-profile-table.cc
+++ b/third_party/tcmalloc/chromium/src/heap-profile-table.cc
@@ -301,8 +301,11 @@ int HeapProfileTable::UnparseBucket(const Bucket& b,
 
 HeapProfileTable::Bucket**
 HeapProfileTable::MakeSortedBucketList() const {
+  // We allocate memory for (num_buckets_ + 1) buckets
+  // because this allocations itself could create a new bucket.
+  // There is no harm even if it doesn't create a new bucket.
   Bucket** list =
-    reinterpret_cast<Bucket**>(alloc_(sizeof(Bucket) * num_buckets_));
+    reinterpret_cast<Bucket**>(alloc_(sizeof(Bucket) * (num_buckets_ + 1)));
 
   int n = 0;
   for (int b = 0; b < kHashTableSize; b++) {