Support piping log data over the service protocol

runtime/vm/service_event.cc

Index: runtime/vm/service_event.cc
diff --git a/runtime/vm/service_event.cc b/runtime/vm/service_event.cc
index a53ace2d9343db46582249460aef121a31a817ad..da211eb1864cd74c3d3331ac4c14b4c5bf6c5777 100644
--- a/runtime/vm/service_event.cc
+++ b/runtime/vm/service_event.cc
@@ -89,6 +89,8 @@ const char* ServiceEvent::KindAsCString() const {
       return "Inspect";
     case kEmbedder:
       return embedder_kind();
+    case kLogging:
+      return "Logging";
     case kDebuggerSettingsUpdate:
       return "_DebuggerSettingsUpdate";
     case kIllegal:
@@ -126,6 +128,9 @@ const char* ServiceEvent::stream_id() const {
     case kEmbedder:
       return embedder_stream_id_;
 
+    case kLogging:
+      return Service::logging_stream.id();
+
     default:
       UNREACHABLE();
       return NULL;
@@ -135,9 +140,7 @@ const char* ServiceEvent::stream_id() const {
 
 void ServiceEvent::PrintJSON(JSONStream* js) const {
   JSONObject jsobj(js);
-  jsobj.AddProperty("type", "Event");
-  jsobj.AddProperty("kind", KindAsCString());
-  jsobj.AddProperty("isolate", isolate());
+  PrintJSONHeader(&jsobj);
   if (kind() == kPauseBreakpoint) {
     JSONArray jsarr(&jsobj, "pauseBreakpoints");
     // TODO(rmacnak): If we are paused at more than one breakpoint,
@@ -179,4 +182,12 @@ void ServiceEvent::PrintJSON(JSONStream* js) const {
   }
 }
 
+
+void ServiceEvent::PrintJSONHeader(JSONObject* jsobj) const {
+  ASSERT(jsobj != NULL);
+  jsobj->AddProperty("type", "Event");
+  jsobj->AddProperty("kind", KindAsCString());
+  jsobj->AddProperty("isolate", isolate());
+}
+
 }  // namespace dart