Add heap allocator usage to task profiler.

base/profiler/scoped_profile.h

Index: base/profiler/scoped_profile.h
diff --git a/base/profiler/scoped_profile.h b/base/profiler/scoped_profile.h
index 657150a0f18dce184cd814dfa08eea8af7c439bc..ed86f460b9af2523258f8d3e5f8b1cdc68b88bd1 100644
--- a/base/profiler/scoped_profile.h
+++ b/base/profiler/scoped_profile.h
@@ -13,6 +13,7 @@
 // macros listed below.
 
 #include "base/base_export.h"
+#include "base/debug/scoped_thread_heap_usage.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/profiler/tracked_time.h"
@@ -57,6 +58,7 @@ class BASE_EXPORT ScopedProfile {
  private:
   Births* birth_;  // Place in code where tracking started.
   TaskStopwatch stopwatch_;
+  base::debug::HeapUsageTracker heap_usage_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedProfile);
 };