Push heap stats as HeapStatsUpdate struct instead of raw array of uint32_t values.

src/profile-generator.h

 // Copyright 2011 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 723 matching lines @@
   EntryInfo(SnapshotObjectId id, Address addr, unsigned int size, bool accessed)
       : id(id), addr(addr), size(size), accessed(accessed) { }
     SnapshotObjectId id;
     Address addr;
     unsigned int size;
     bool accessed;
   };
   struct TimeInterval {
     explicit TimeInterval(SnapshotObjectId id) : id(id), size(0), count(0) { }
     SnapshotObjectId id;
-    unsigned int size;
+    uint32_t size;
     uint32_t count;
   };
 
   void UpdateHeapObjectsMap();
   void RemoveDeadEntries();
 
   static bool AddressesMatch(void* key1, void* key2) {
     return key1 == key2;
   }
 
@@ skipping 437 matching lines @@
 
   friend class HeapSnapshotJSONSerializerEnumerator;
   friend class HeapSnapshotJSONSerializerIterator;
 
   DISALLOW_COPY_AND_ASSIGN(HeapSnapshotJSONSerializer);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROFILE_GENERATOR_H_