Ensure embedder timeline callbacks are called for service protocol requests

runtime/vm/json_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
 #include "vm/json_stream.h"
 #include "vm/unit_test.h"
 #include "vm/dart_api_impl.h"
 
@@ skipping 297 matching lines @@
   EXPECT(js.num_params() == 0);
   js.SetParams(&param_keys[0], &param_values[0], 2);
   EXPECT(js.num_params() == 2);
   EXPECT(!js.HasParam("lizard"));
   EXPECT(js.HasParam("dog"));
   EXPECT(js.HasParam("cat"));
   EXPECT(js.ParamIs("cat", "banana"));
   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