VM: Free [TimelineEventBlock]s before shutting down

runtime/vm/timeline.cc

 // 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 PRODUCT
 
 #include <errno.h>
 #include <fcntl.h>
 #include <cstdlib>
 
@@ skipping 1487 matching lines @@
 
 void TimelineEventCallbackRecorder::CompleteEvent(TimelineEvent* event) {
   OnEvent(event);
   delete event;
 }
 
 
 TimelineEventEndlessRecorder::TimelineEventEndlessRecorder()
     : head_(NULL), block_index_(0) {}
 
+TimelineEventEndlessRecorder::~TimelineEventEndlessRecorder() {
+  TimelineEventBlock* current = head_;
+  head_ = NULL;
+
+  while (current != NULL) {
+    TimelineEventBlock* next = current->next();
+    delete current;
+    current = next;
+  }
+}
 
 void TimelineEventEndlessRecorder::PrintJSON(JSONStream* js,
                                              TimelineEventFilter* filter) {
   if (!FLAG_support_service) {
     return;
   }
   JSONObject topLevel(js);
   topLevel.AddProperty("type", "_Timeline");
   {
     JSONArray events(&topLevel, "traceEvents");
@@ skipping 246 matching lines @@
 TimelineEventBlock* TimelineEventBlockIterator::Next() {
   ASSERT(current_ != NULL);
   TimelineEventBlock* r = current_;
   current_ = current_->next();
   return r;
 }
 
 }  // namespace dart
 
 #endif  // !PRODUCT