Support JSON-RPC 2.0-compatible VM service events.

runtime/observatory/lib/service_common.dart

Index: runtime/observatory/lib/service_common.dart
diff --git a/runtime/observatory/lib/service_common.dart b/runtime/observatory/lib/service_common.dart
index 0580f5cdbd08a21802eca79a8dcfcfa3b043a504..0faa080bb8cc00abe77b3eca452d9434894e26a1 100644
--- a/runtime/observatory/lib/service_common.dart
+++ b/runtime/observatory/lib/service_common.dart
@@ -204,11 +204,11 @@ abstract class CommonWebSocketVM extends VM {
           bytes.offsetInBytes + offset,
           bytes.lengthInBytes - offset);
       var map = _parseJSON(meta);
-      if (map == null) {
+      if (map == null || map['method'] != 'streamNotify') {
         return;
       }
-      var event = map['event'];
-      var streamId = map['streamId'];
+      var event = map['params']['event'];
+      var streamId = map['params']['streamId'];
       postServiceEvent(streamId, event, data);
     });
   }
@@ -218,9 +218,10 @@ abstract class CommonWebSocketVM extends VM {
     if (map == null) {
       return;
     }
-    var event = map['event'];
-    if (event != null) {
-      var streamId = map['streamId'];
+
+    if (map['method'] == 'streamNotify') {
+      var event = map['params']['event'];
+      var streamId = map['params']['streamId'];
       postServiceEvent(streamId, event, null);
       return;
     }