Dump type statistics of malloc'ed objects.

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 1c5fcf088e297739303d400da5f3d198bff7087b..04704f26050ecffce71085b6c6c69157872ff481 100644
--- a/third_party/tcmalloc/chromium/src/heap-profiler.cc
+++ b/third_party/tcmalloc/chromium/src/heap-profiler.cc
@@ -125,6 +125,11 @@ DEFINE_bool(only_mmap_profile,
 DEFINE_bool(deep_heap_profile,
             EnvToBool("DEEP_HEAP_PROFILE", false),
             "If heap-profiling is on, profile deeper (only on Linux)");
+#if defined(TYPE_PROFILING)
+DEFINE_bool(heap_profile_type_statistics,
+            EnvToBool("HEAP_PROFILE_TYPE_STATISTICS", false),
+            "If heap-profiling is on, dump type statistics.");
+#endif  // defined(TYPE_PROFILING)
 
 
 //----------------------------------------------------------------------
@@ -305,6 +310,15 @@ static void DumpProfileLocked(const char* reason) {
   RawWrite(fd, profile, strlen(profile));
   RawClose(fd);
 
+#if defined(TYPE_PROFILING)
+  if (FLAGS_heap_profile_type_statistics) {
+    snprintf(file_name, sizeof(file_name), "%s.%05d.%04d.type",
+             filename_prefix, getpid(), dump_count);
+    RAW_VLOG(0, "Dumping type statistics to %s", file_name);
+    heap_profile->DumpTypeStatistics(file_name);
+  }
+#endif  // defined(TYPE_PROFILING)
+
   dumping = false;
 }