[flutter_tools] re-enable debug extension (#53765)

packages/flutter_tools/lib/src/build_runner/devfs_web.dart

@@ -36,6 +36,22 @@ import '../globals.dart' as globals;
 import '../web/bootstrap.dart';
 import '../web/chrome.dart';
 
+typedef DwdsLauncher = Future<Dwds> Function({
+  @required AssetReader assetReader,
+  @required Stream<BuildResult> buildResults,
+  @required ConnectionProvider chromeConnection,
+  @required LoadStrategy loadStrategy,
+  @required bool enableDebugging,
+  bool enableDebugExtension,
+  String hostname,
+  bool useSseForDebugProxy,
+  bool serveDevTools,
+  void Function(Level, String) logWriter,
+  bool verbose,
+  UrlEncoder urlEncoder,
+  ExpressionCompiler expressionCompiler,
+});
+
 /// An expression compiler connecting to FrontendServer
 ///
 /// This is only used in development mode
@@ -87,7 +103,6 @@ class WebAssetServer implements AssetReader {
   static const String _kDefaultMimeType = 'application/octet-stream';
 
   final Map<String, String> _modules;
-
   final Map<String, String> _digests;
 
   void performRestart(List<String> modules) {
@@ -121,6 +136,7 @@ class WebAssetServer implements AssetReader {
     Uri entrypoint,
     ExpressionCompiler expressionCompiler, {
     bool testMode = false,
+    DwdsLauncher dwdsLauncher = Dwds.start,
   }) async {
     try {
       final InternetAddress address = (await InternetAddress.lookup(hostname)).first;
@@ -184,8 +200,9 @@ class WebAssetServer implements AssetReader {
       }
 
       // In debug builds, spin up DWDS and the full asset server.
-      final Dwds dwds = await Dwds.start(
+      final Dwds dwds = await dwdsLauncher(
         assetReader: server,
+        enableDebugExtension: true,
         buildResults: const Stream<BuildResult>.empty(),
         chromeConnection: () async {
           final Chrome chrome = await ChromeLauncher.connectedInstance;

packages/flutter_tools/test/general.shard/web/devfs_web_test.dart

@@ -2,14 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:async';
 import 'dart:io';
 
+import 'package:dwds/data/build_result.dart';
+import 'package:dwds/dwds.dart';
+import 'package:dwds/src/loaders/strategy.dart';
+import 'package:dwds/src/readers/asset_reader.dart';
+import 'package:dwds/src/services/expression_compiler.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/io.dart';
 import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/compile.dart';
 import 'package:flutter_tools/src/convert.dart';
 import 'package:flutter_tools/src/build_runner/devfs_web.dart';
+import 'package:logging/logging.dart';
 import 'package:mockito/mockito.dart';
 // TODO(bkonyi): remove deprecated member usage, https://github.com/flutter/flutter/issues/51951
 // ignore: deprecated_member_use
@@ -432,7 +439,43 @@ void main() {
 
     await webDevFS.destroy();
   }));
+
+  test('Launches DWDS with the correct arguments', () => testbed.run(() async {
+    final WebAssetServer server = await WebAssetServer.start(
+      'localhost',
+      8123,
+      (String url) => null,
+      BuildMode.debug,
+      true,
+      Uri.file('test.dart'),
+      null,
+      dwdsLauncher: ({
+        AssetReader assetReader,
+        Stream<BuildResult> buildResults,
+        ConnectionProvider chromeConnection,
+        bool enableDebugExtension,
+        bool enableDebugging,
+        ExpressionCompiler expressionCompiler,
+        String hostname,
+        LoadStrategy loadStrategy,
+        void Function(Level, String) logWriter,
+        bool serveDevTools,
+        UrlEncoder urlEncoder,
+        bool useSseForDebugProxy,
+        bool verbose,
+      }) async {
+        expect(serveDevTools, false);
+        expect(verbose, null);
+        expect(enableDebugging, true);
+        expect(enableDebugExtension, true);
+
+        return MockDwds();
+      });
+
+      await server.dispose();
+  }));
 }
 
 class MockHttpServer extends Mock implements HttpServer {}
 class MockResidentCompiler extends Mock implements ResidentCompiler {}
+class MockDwds extends Mock implements Dwds {}