Add size metric into Heap Stats.

include/v8-profiler.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 411 matching lines @@
    * this method, all heap objects relocations done by the garbage collector
    * are being registered.
    */
   static void StartHeapObjectsTracking();
 
   /**
    * Adds a new time interval entry to the aggregated statistics array. The
    * time interval entry contains information on the current heap objects
    * population size. The method also updates aggregated statistics and
    * reports updates for all previous time intervals via the OutputStream
-   * object. Updates on each time interval are provided as pairs of time
-   * interval index and updated heap objects count.
+   * object. Updates on each time interval are provided as a triplet. It has
+   * time interval index, updated heap objects count and updated heap objects
+   * size.
    *
    * StartHeapObjectsTracking must be called before the first call to this
    * method.
    */
   static void PushHeapObjectsStats(OutputStream* stream);
 
   /**
    * Stops tracking of heap objects population statistics, cleans up all
    * collected data. StartHeapObjectsTracking must be called again prior to
    * calling PushHeapObjectsStats next time.
@@ skipping 97 matching lines @@
 };
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 
 
 #endif  // V8_V8_PROFILER_H_