Move all service objects to one file ahead of refactor.

runtime/bin/vmservice/client/lib/src/service/vm.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of service;
-
-abstract class VM extends Observable {
-  @reflectable IsolateList _isolates;
-  @reflectable IsolateList get isolates => _isolates;
-
-  void _initOnce() {
-    assert(_isolates == null);
-    _isolates = new IsolateList(this);
-  }
-
-  VM() {
-    _initOnce();
-  }
-
-  /// Get [id] as an [ObservableMap] from the service directly.
-  Future<ObservableMap> getAsMap(String id) {
-    return getString(id).then((response) {
-      try {
-        var map = JSON.decode(response);
-        Logger.root.info('Decoded $id');
-        return toObservable(map);
-      } catch (e, st) {
-        return toObservable({
-          'type': 'Error',
-          'id': '',
-          'kind': 'DecodeError',
-          'message': '$e',
-        });
-      }
-    }).catchError((error) {
-      return toObservable({
-        'type': 'Error',
-        'id': '',
-        'kind': 'LastResort',
-        'message': '$error'
-      });
-    });
-  }
-
-  /// Get [id] as a [String] from the service directly. See [getAsMap].
-  Future<String> getString(String id);
-}