Add API to set thread name

runtime/vm/dart_api_impl_test.cc

Index: runtime/vm/dart_api_impl_test.cc
diff --git a/runtime/vm/dart_api_impl_test.cc b/runtime/vm/dart_api_impl_test.cc
index 6cbf9f304bcb0e9fffca1b619ae1ee4a76c99630..7ccf6a0bda4eafc31c76e30dce7ff954b084e87b 100644
--- a/runtime/vm/dart_api_impl_test.cc
+++ b/runtime/vm/dart_api_impl_test.cc
@@ -9548,14 +9548,6 @@ TEST_CASE(Timeline_Dart_GlobalTimelineGetTrace) {
                        1,
                        &arg_names[0],
                        &arg_values[0]);
-    // Add metadata to the embedder stream.
-    Dart_TimelineEvent("METADATA_EVENT",
-                       Dart_TimelineGetMicros(),
-                       0,
-                       Dart_Timeline_Event_Metadata,
-                       0,
-                       NULL,
-                       NULL);
     // Add counter to the embedder stream.
     Dart_TimelineEvent("COUNTER_EVENT",
                        Dart_TimelineGetMicros(),
@@ -9564,6 +9556,7 @@ TEST_CASE(Timeline_Dart_GlobalTimelineGetTrace) {
                        0,
                        NULL,
                        NULL);
+    Dart_SetThreadName("CUSTOM THREAD NAME");
   }
 
   // Invoke main, which will be compiled resulting in a compiler event in
@@ -9608,8 +9601,8 @@ TEST_CASE(Timeline_Dart_GlobalTimelineGetTrace) {
   EXPECT_SUBSTRING("TRACE_EVENT", buffer);
   EXPECT_SUBSTRING("arg0", buffer);
   EXPECT_SUBSTRING("value0", buffer);
-  EXPECT_SUBSTRING("METADATA_EVENT", buffer);
   EXPECT_SUBSTRING("COUNTER_EVENT", buffer);
+  EXPECT_SUBSTRING("CUSTOM THREAD NAME", buffer);
 
   // Free buffer allocated by AppendStreamConsumer
   free(data.buffer);