[vm] Support flow events in Dart_TimelineEvent.

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 RUNTIME_INCLUDE_DART_TOOLS_API_H_
 #define RUNTIME_INCLUDE_DART_TOOLS_API_H_
 
 #include "dart_api.h"
 
 /** \mainpage Dart Tools Embedding API Reference
@@ skipping 1006 matching lines @@
 
 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_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_Flow_Begin,     // Phase = 's'.
+  Dart_Timeline_Event_Flow_Step,      // Phase = 't'.
+  Dart_Timeline_Event_Flow_End,       // Phase = 'f'.
 } 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 35 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  // RUNTIME_INCLUDE_DART_TOOLS_API_H_