Add ability for embedder to provide private timeline trace data

runtime/vm/timeline.h

 // Copyright (c) 2015, 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 VM_TIMELINE_H_
 #define VM_TIMELINE_H_
 
+#include "include/dart_tools_api.h"
+
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
 #include "vm/os.h"
 
 namespace dart {
 
 class JSONArray;
 class JSONObject;
 class JSONStream;
 class Object;
@@ skipping 40 matching lines @@
   static void Clear();
 
   // Print information about streams to JSON.
   static void PrintFlagsToJSON(JSONStream* json);
 
 #define ISOLATE_TIMELINE_STREAM_FLAGS(name, not_used)                          \
   static const bool* Stream##name##EnabledFlag() {                             \
     return &stream_##name##_enabled_;                                          \
   }                                                                            \
   static void SetStream##name##Enabled(bool enabled) {                         \
+    StreamStateChange(#name, stream_##name##_enabled_, enabled);               \
     stream_##name##_enabled_ = enabled;                                        \
   }
   ISOLATE_TIMELINE_STREAM_LIST(ISOLATE_TIMELINE_STREAM_FLAGS)
 #undef ISOLATE_TIMELINE_STREAM_FLAGS
   static void SetVMStreamEnabled(bool enabled);
 
+  static void set_start_recording_cb(
+      Dart_EmbedderTimelineStartRecording start_recording_cb) {
+    start_recording_cb_ = start_recording_cb;
+  }
+
+  static Dart_EmbedderTimelineStartRecording get_start_recording_cb() {
+    return start_recording_cb_;
+  }
+
+  static void set_stop_recording_cb(
+      Dart_EmbedderTimelineStopRecording stop_recording_cb) {
+    stop_recording_cb_ = stop_recording_cb;
+  }
+
+  static Dart_EmbedderTimelineStopRecording get_stop_recording_cb() {
+    return stop_recording_cb_;
+  }
+
+  static void set_get_timeline_cb(
+      Dart_EmbedderTimelineGetTimeline get_timeline_cb) {
+    get_timeline_cb_ = get_timeline_cb;
+  }
+
+  static Dart_EmbedderTimelineGetTimeline get_get_timeline_cb() {
+    return get_timeline_cb_;
+  }
+
  private:
+  static void StreamStateChange(const char* stream_name, bool prev, bool curr);
   static TimelineEventRecorder* recorder_;
   static TimelineStream vm_stream_;
   static TimelineStream vm_api_stream_;
   static MallocGrowableArray<char*>* enabled_streams_;
+  static Dart_EmbedderTimelineStartRecording start_recording_cb_;
+  static Dart_EmbedderTimelineStopRecording stop_recording_cb_;
+  static Dart_EmbedderTimelineGetTimeline get_timeline_cb_;
 
 #define ISOLATE_TIMELINE_STREAM_DECLARE_FLAG(name, not_used)                   \
   static bool stream_##name##_enabled_;
   ISOLATE_TIMELINE_STREAM_LIST(ISOLATE_TIMELINE_STREAM_DECLARE_FLAG)
 #undef ISOLATE_TIMELINE_STREAM_DECLARE_FLAG
 
   friend class TimelineRecorderOverride;
   friend class ReclaimBlocksIsolateVisitor;
 };
 
@@ skipping 679 matching lines @@
 
  private:
   TimelineEventBlock* current_;
   TimelineEventRecorder* recorder_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_TIMELINE_H_