Ensure embedder timeline callbacks are called for service protocol requests

runtime/vm/dart_api_impl_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 "bin/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
@@ skipping 9809 matching lines @@
 TEST_CASE(Timeline_Dart_EmbedderTimelineGetTimeline) {
   Dart_SetEmbedderTimelineCallbacks(NULL, NULL, GetTimeline);
 
   Dart_GlobalTimelineSetRecordedStreams(DART_TIMELINE_STREAM_EMBEDDER);
   Dart_TimelineDuration("testDurationEvent", 0, 1);
 
   AppendData data;
   bool success = Dart_GlobalTimelineGetTrace(AppendStreamConsumer, &data);
   EXPECT(success);
 
-  EXPECT_SUBSTRING("HELLO FROM EMBEDDER,{\"name\":\"testDurationEvent\"",
+  EXPECT_SUBSTRING("}},HELLO FROM EMBEDDER",
                    data.buffer);
 
   // Free buffer allocated by AppendStreamConsumer
   free(data.buffer);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart