Finish moving service protocol to json rpc.

runtime/vm/service/service.idl

 //
 // TODO(turnidge): Finish writing an idl description of the service protocol.
 //
 
 interface Service {
+  getVM() VM
+
+  getFlagList() FlagList
+
+  setFlag(name string, value string) Response
+
+  getObject(isolateId string, objectId string) Object
+
+  // The response is a subtype of Object or ObjectRef.
+  getObjectByAddress(address string, ref bool) Response
+
   // Returns the list of breakpoints for an isolate.
   getBreakpoints(isolateId string) BreakpointList
 
   // Adds a breakpoint at the specified line.
   //
   // TODO(turnidge): Make line an int instead of a string.
   addBreakpoint(isolateId string,
                 scriptId string,
                 line string) Breakpoint
 
@@ skipping 104 matching lines @@
   type    string
 
   // Some responses will have the <code>_vmType</code> property.  This
   // provides the VM-internal type name of an object, and is provided
   // only when this type name differs from the <code>type</code>
   // property.
   _vmType string [optional]
 }
 
 
+struct VM extends Response {
+  placeholder int
+}
+
+
+struct FlagList extends Response {
+  placeholder int
+}
+
+
 struct _EchoResponse extends Response {
   text string
 }
 
 
 // Persistent objects in the vm are returned as subclasses of Object.
 struct Object extends Response {
   // The object <code>id</code> can be used to refer to a persistent
   // object inside the vm or an isolate.
   id  string
@@ skipping 248 matching lines @@
   VMOnly
   None
 }
 
 // A <code>MetricSelector</code> is used to indicate which list of metrics
 // should be retrieved from an isolate.
 enum MetricSelector {
   Dart,
   Native,
 }