Allow setting break-on-exceptions option 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 2c6680df21b2c1cc862434a8154dd7ddf25bfa73..4b75a16c4fb44f3a7c1cfb291d5cf5450522fc25 100644
--- a/runtime/vm/service_event.cc
+++ b/runtime/vm/service_event.cc
@@ -84,6 +84,8 @@ const char* ServiceEvent::EventTypeToCString(EventType type) {
       return "GC";  // TODO(koda): Change to GarbageCollected.
     case kInspect:
       return "Inspect";
+    case kDebuggerSettingsUpdate:
+      return "_DebuggerSettingsUpdate";
     case kIllegal:
       return "Illegal";
     default:
@@ -110,6 +112,7 @@ const char* ServiceEvent::stream_id() const {
     case kBreakpointResolved:
     case kBreakpointRemoved:
     case kInspect:
+    case kDebuggerSettingsUpdate:
       return "Debug";
 
     case kGC:
@@ -139,6 +142,10 @@ void ServiceEvent::PrintJSON(JSONStream* js) const {
       jsobj.AddProperty("breakpoint", breakpoint());
     }
   }
+  if (type() == kDebuggerSettingsUpdate) {
+    JSONObject jssettings(&jsobj, "_debuggerSettings");
+    isolate()->debugger()->PrintSettingsToJSONObject(&jssettings);
+  }
   if (top_frame() != NULL) {
     JSONObject jsFrame(&jsobj, "topFrame");
     top_frame()->PrintToJSONObject(&jsFrame);