Add accumulator to allocation profiler

runtime/vm/json_stream.cc

Index: runtime/vm/json_stream.cc
diff --git a/runtime/vm/json_stream.cc b/runtime/vm/json_stream.cc
index 1c60d5bf4e11adce5052ece295262f1c68d0fa75..9fffcae4aa0818b587202c4e45024bd246f1ae51 100644
--- a/runtime/vm/json_stream.cc
+++ b/runtime/vm/json_stream.cc
@@ -182,6 +182,12 @@ void JSONStream::PrintValue(intptr_t i) {
 }
 
 
+void JSONStream::PrintValue64(int64_t i) {
+  PrintCommaIfNeeded();
+  buffer_.Printf("%" Pd64 "", i);
+}
+
+
 void JSONStream::PrintValue(double d) {
   PrintCommaIfNeeded();
   buffer_.Printf("%f", d);
@@ -239,6 +245,12 @@ void JSONStream::PrintProperty(const char* name, intptr_t i) {
 }
 
 
+void JSONStream::PrintProperty64(const char* name, int64_t i) {
+  PrintPropertyName(name);
+  PrintValue64(i);
+}
+
+
 void JSONStream::PrintProperty(const char* name, double d) {
   PrintPropertyName(name);
   PrintValue(d);