Return cross extension debug response (#1267)

* Return cross extension debug response

* update comment

Author: grouma

dwds/debug_extension/CHANGELOG.md

@@ -1,4 +1,9 @@
-## 1.19-dev
+## 1.20
+
+- Return response when `dwds.startDebugging` is called.
+
+
+## 1.19
 
 - Support cross-extension communication for use with Google specific extensions.
 

dwds/debug_extension/pubspec.yaml

@@ -1,6 +1,6 @@
 name: extension
 publish_to: none
-version: 1.19.0-dev
+version: 1.20.0
 author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/webdev
 description: >-

dwds/debug_extension/web/background.dart

@@ -133,6 +133,9 @@ void main() {
         sendResponse(_tabIdToEncodedUri[request.tabId] ?? '');
       } else if (request.name == 'dwds.startDebugging') {
         startDebugging(null);
+        // TODO(grouma) - Actually determine if debugging initiated
+        // successfully.
+        sendResponse(true);
       } else {
         sendResponse(
             ErrorResponse()..error = 'Unknown request name: ${request.name}');