Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

runtime/vm/service/vmservice.dart

Index: runtime/vm/service/vmservice.dart
diff --git a/runtime/vm/service/vmservice.dart b/runtime/vm/service/vmservice.dart
index f569a8e6dfbd7ac85c1b5aac7d435dcb99aa3920..3c5ed243ff6a8cf1cc4dd9e79114ecbe9fef38ef 100644
--- a/runtime/vm/service/vmservice.dart
+++ b/runtime/vm/service/vmservice.dart
@@ -142,8 +142,14 @@ class VMService extends MessageRouter {
       _clientCollection(message);
       return message.response;
     }
-    if (message.path[0] == 'isolates') {
-      return runningIsolates.route(message);
+    if (message.isOld) {
+      if (message.path[0] == 'isolates') {
+        return runningIsolates.route(message);
+      }
+    } else {
+      if (message.params['isolate'] != null) {
+        return runningIsolates.route(message);
+      }
     }
     return message.sendToVM();
   }
@@ -162,4 +168,4 @@ void _registerIsolate(int port_id, SendPort sp, String name) {
 void _setEventMask(int mask)
     native "VMService_SetEventMask";
 
-void _onStart() native "VMService_OnStart";
+void _onStart() native "VMService_OnStart";