Ensure embedder timeline callbacks are called for service protocol requests

runtime/vm/json_test.cc

Index: runtime/vm/json_test.cc
diff --git a/runtime/vm/json_test.cc b/runtime/vm/json_test.cc
index 7c5b49f81a149483cbccde503cf832ef7b39f1ec..e8c4f5d959a52812890373d21543ee83526858fe 100644
--- a/runtime/vm/json_test.cc
+++ b/runtime/vm/json_test.cc
@@ -315,6 +315,33 @@ TEST_CASE(JSON_JSONStream_Params) {
   EXPECT(!js.ParamIs("dog", "banana"));
 }
 
+
+TEST_CASE(JSON_JSONStream_AppendJSONStreamConsumer) {
+  JSONStream js;
+
+  {
+    JSONObject obj(&js);
+    {
+      JSONArray arr(&obj, "test");
+      const char* test_data = "{a, b, c},";
+      AppendJSONStreamConsumer(Dart_StreamConsumer_kData, "",
+                               reinterpret_cast<const uint8_t*>(&test_data[0]),
+                               strlen(test_data),
+                               &js);
+      AppendJSONStreamConsumer(Dart_StreamConsumer_kData, "",
+                               reinterpret_cast<const uint8_t*>(&test_data[0]),
+                               strlen(test_data),
+                               &js);
+      AppendJSONStreamConsumer(Dart_StreamConsumer_kData, "",
+                               reinterpret_cast<const uint8_t*>(&test_data[0]),
+                               strlen(test_data) - 1,
+                               &js);
+    }
+  }
+
+  EXPECT_STREQ("{\"test\":[{a, b, c},{a, b, c},{a, b, c}]}", js.ToCString());
+}
+
 #endif  // !PRODUCT
 
 }  // namespace dart