[ CLI ] Fix IPv6 VM service support for standalone VM

The CLI was not providing the ipv6 flag to DDS, resulting in a "Could
not start Observatory" error.

Change-Id: Idff0f525455f121b8f1e89bc4ad20a01cd1165ef
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/204860
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>

pkg/dartdev/test/commands/run_test.dart

@@ -237,6 +237,28 @@ void main(List<String> args) => print("$b $args");
     );
     expect(result.stderr, isEmpty);
     expect(result.exitCode, 0);
+
+    // Again, with IPv6.
+    result = p.runSync([
+      'run',
+      '--observe=8181/::1',
+      '--pause-isolates-on-start',
+      // This should negate the above flag.
+      '--no-pause-isolates-on-start',
+      '--no-pause-isolates-on-exit',
+      '--no-pause-isolates-on-unhandled-exceptions',
+      '-Dfoo=bar',
+      '--define=bar=foo',
+      p.relativeFilePath,
+    ]);
+
+    expect(
+      result.stdout,
+      matches(
+          r'Observatory listening on http:\/\/\[::1\]:8181\/[a-zA-Z0-9_-]+=\/\n.*'),
+    );
+    expect(result.stderr, isEmpty);
+    expect(result.exitCode, 0);
   });
 
   test('fails when provided verbose VM flags', () async {

pkg/dds/bin/dds.dart

@@ -53,6 +53,7 @@ Future<void> main(List<String> args) async {
       remoteVmServiceUri,
       serviceUri: serviceUri,
       enableAuthCodes: !disableServiceAuthCodes,
+      ipv6: address.type == InternetAddressType.IPv6,
       devToolsConfiguration: startDevTools && devToolsBuildDirectory != null
           ? DevToolsConfiguration(
               enable: startDevTools,