Enable memory profiler when TC_MALLOC is enabled for

third_party/tcmalloc/chromium/src/malloc_extension.cc

Index: third_party/tcmalloc/chromium/src/malloc_extension.cc
===================================================================
--- third_party/tcmalloc/chromium/src/malloc_extension.cc	(revision 148994)
+++ third_party/tcmalloc/chromium/src/malloc_extension.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2005, Google Inc.
+// Copyright (c) 2012, Google Inc.
 // All rights reserved.
 // 
 // Redistribution and use in source and binary forms, with or without
@@ -50,6 +50,7 @@
 #include "gperftools/malloc_extension.h"
 #include "gperftools/malloc_extension_c.h"
 #include "maybe_threads.h"
+#include "thread_cache.h"
 
 using STL_NAMESPACE::string;
 using STL_NAMESPACE::vector;
@@ -220,6 +221,10 @@
   }
 }
 
+unsigned int MallocExtension::GetBytesAllocatedOnCurrentThread() {
+  return tcmalloc::ThreadCache::GetBytesAllocatedOnCurrentThread();
+}
+
 // -----------------------------------------------------------------------
 // Heap sampling support
 // -----------------------------------------------------------------------