Initial Timeline Events

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index d49b7f4b88d8f6de906b8b8ff191a0ce90b31fb5..129b77a63679829b4cf5a68b389296831b0d64c4 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -27,6 +27,7 @@
 #include "vm/symbols.h"
 #include "vm/thread_interrupter.h"
 #include "vm/thread_pool.h"
+#include "vm/timeline.h"
 #include "vm/virtual_memory.h"
 #include "vm/zone.h"
 
@@ -324,6 +325,8 @@ RawError* Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
   const UserTag& default_tag = UserTag::Handle(UserTag::DefaultTag());
   isolate->set_current_tag(default_tag);
 
+  isolate->SetTimelineEventBuffer(new TimelineEventBuffer());
+
   if (FLAG_keep_code) {
     isolate->set_deoptimized_code_array(
       GrowableObjectArray::Handle(GrowableObjectArray::New()));