Stream blocks of timeline events over the service protocol

runtime/vm/service.cc

Index: runtime/vm/service.cc
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index 00e8db4f6df287d9fc93f937f28f18292b27e328..aca3a5b713494324f3422d90d58114bc74e91dee 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -122,6 +122,7 @@ StreamInfo Service::echo_stream("_Echo");
 StreamInfo Service::graph_stream("_Graph");
 StreamInfo Service::logging_stream("_Logging");
 StreamInfo Service::extension_stream("Extension");
+StreamInfo Service::timeline_stream("Timeline");
 
 static StreamInfo* streams_[] = {
   &Service::vm_stream,
@@ -132,6 +133,7 @@ static StreamInfo* streams_[] = {
   &Service::graph_stream,
   &Service::logging_stream,
   &Service::extension_stream,
+  &Service::timeline_stream,
 };