Add global functions for dart.developer.registerExtension and dart.developer.postEvent (#1322)

Prototype of debug channel.

Towards flutter/flutter#75225

Author: grouma

dwds/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 11.1.0
+
+- Add global functions to the injected client for `dart.developer.postEvent`
+  and `dart.developer.registerExtension`.
+
 ## 11.0.2
 
 - Implement `_flutter.listViews` extension method in dwds vm client.

dwds/lib/data/build_result.g.dart

@@ -0,0 +1,24 @@
+// Copyright (c) 2021, 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.
+
+// @dart = 2.9
+
+import 'package:built_value/built_value.dart';
+import 'package:built_value/serializer.dart';
+
+part 'debug_event.g.dart';
+
+abstract class DebugEvent implements Built<DebugEvent, DebugEventBuilder> {
+  static Serializer<DebugEvent> get serializer => _$debugEventSerializer;
+
+  factory DebugEvent([Function(DebugEventBuilder) updates]) = _$DebugEvent;
+
+  DebugEvent._();
+
+  String get kind;
+
+  String get eventData;
+
+  int get timestamp;
+}