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

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index d9a0c4e2df5b55d79ad082bab435b922d23ef148..fa5a4ebebe1e391220f77df046fadda356d19700 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -559,6 +559,18 @@ class V8EXPORT RetainedObjectInfo {  // NOLINT
 };
 
 
+/**
+ * A struct for exporting HeapStats data from V8, using "push" model.
+ */
+struct HeapStatsUpdate {
+  HeapStatsUpdate(uint32_t index, uint32_t count, uint32_t size)
+    : index(index), count(count), size(size) { }
+  uint32_t index;  // Index of the time interval that was changed.
+  uint32_t count;  // New value of count field for the interval with this index.
+  uint32_t size;  // New value of size field for the interval with this index.
+};
+
+
 }  // namespace v8