[flutter drive] Do not start dds if --no-dds (#81784)

packages/flutter_tools/lib/src/drive/drive_service.dart

@@ -204,19 +204,21 @@ class FlutterDriverService extends DriverService {
     }
     _vmServiceUri = uri.toString();
     _device = device;
-    try {
-      await device.dds.startDartDevelopmentService(
-        uri,
-        debuggingOptions.ddsPort,
-        ipv6,
-        debuggingOptions.disableServiceAuthCodes,
-        logger: _logger,
-      );
-      _vmServiceUri = device.dds.uri.toString();
-    } on dds.DartDevelopmentServiceException {
-      // If there's another flutter_tools instance still connected to the target
-      // application, DDS will already be running remotely and this call will fail.
-      // This can be ignored to continue to use the existing remote DDS instance.
+    if (debuggingOptions.enableDds) {
+      try {
+        await device.dds.startDartDevelopmentService(
+          uri,
+          debuggingOptions.ddsPort,
+          ipv6,
+          debuggingOptions.disableServiceAuthCodes,
+          logger: _logger,
+        );
+        _vmServiceUri = device.dds.uri.toString();
+      } on dds.DartDevelopmentServiceException {
+        // If there's another flutter_tools instance still connected to the target
+        // application, DDS will already be running remotely and this call will fail.
+        // This can be ignored to continue to use the existing remote DDS instance.
+      }
     }
     _vmService = await _vmServiceConnector(uri, device: _device);
     final DeviceLogReader logReader = await device.getLogReader(app: _applicationPackage);

packages/flutter_tools/test/general.shard/drive/drive_service_test.dart

@@ -222,7 +222,7 @@ void main() {
         command: <String>['dart', 'foo.test', '-rexpanded'],
         exitCode: 11,
         environment: <String, String>{
-          'VM_SERVICE_URL': 'http://127.0.0.1:1234/'
+          'VM_SERVICE_URL': 'http://127.0.0.1:63426/1UasC_ihpXY=/'
         },
       ),
     ]);
@@ -230,8 +230,12 @@ void main() {
     final Device device = FakeDevice(LaunchResult.succeeded(
       observatoryUri: Uri.parse('http://127.0.0.1:63426/1UasC_ihpXY=/'),
     ));
+    final FakeDartDevelopmentService dds = device.dds as FakeDartDevelopmentService;
 
+    expect(dds.started, false);
     await driverService.start(BuildInfo.profile, device, DebuggingOptions.enabled(BuildInfo.profile, enableDds: false), true);
+    expect(dds.started, false);
+
     final int testResult = await driverService.startTest(
       'foo.test',
       <String>[],
@@ -240,6 +244,7 @@ void main() {
     );
 
     expect(testResult, 11);
+    expect(dds.started, false);
   });
 
   testWithoutContext('Safely stops and uninstalls application', () async {