Add support for async, metadata, and counter timeline events to be reported by the embedder

runtime/include/dart_tools_api.h

 // Copyright (c) 2011, 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.
 
 #ifndef INCLUDE_DART_TOOLS_API_H_
 #define INCLUDE_DART_TOOLS_API_H_
 
 #include "include/dart_api.h"
 
 /** \mainpage Dart Tools Embedding API Reference
@@ skipping 965 matching lines @@
  * \param user_data User data passed into consumer.
  *
  * NOTE: The trace-event format is documented here: https://goo.gl/hDZw5M
  *
  * \return True if a stream was output.
  */
 DART_EXPORT bool Dart_GlobalTimelineGetTrace(Dart_StreamConsumer consumer,
                                              void* user_data);
 
 typedef enum {
-  Dart_Timeline_Event_Begin,       // Phase = 'B'.
-  Dart_Timeline_Event_End,         // Phase = 'E'.
-  Dart_Timeline_Event_Instant,     // Phase = 'i'.
-  Dart_Timeline_Event_Duration,    // Phase = 'X'.
+  Dart_Timeline_Event_Begin,          // Phase = 'B'.
+  Dart_Timeline_Event_End,            // Phase = 'E'.
+  Dart_Timeline_Event_Instant,        // Phase = 'i'.
+  Dart_Timeline_Event_Duration,       // Phase = 'X'.
+  Dart_Timeline_Event_Async_Begin,    // Phase = 'b'.
+  Dart_Timeline_Event_Async_End,      // Phase = 'e'.
+  Dart_Timeline_Event_Async_Instant,  // Phase = 'n'.
+  Dart_Timeline_Event_Counter,        // Phase = 'C'.
+  Dart_Timeline_Event_Metadata,       // Phase = 'M'.
 } Dart_Timeline_Event_Type;
 
 /**
  * Add a timeline event to the embedder stream.
  *
  * \param label The name of the evnet.
  * \param timestamp0 The first timestamp of the event.
  * \param timestamp1_or_async_id The second timestamp of the event or
  *     the async id.
  * \param argument_count The number of argument names and values.
@@ skipping 88 matching lines @@
  * \param start_recording See Dart_EmbedderTimelineStartRecording.
  * \param stop_recording See Dart_EmbedderTimelineStopRecording.
  *
  * NOTE: To avoid races, this should be called before Dart_Initialize.
  */
 DART_EXPORT void Dart_SetEmbedderTimelineCallbacks(
     Dart_EmbedderTimelineStartRecording start_recording,
     Dart_EmbedderTimelineStopRecording stop_recording);
 
 #endif  // INCLUDE_DART_TOOLS_API_H_