Add platform_interaction_test_swift to devicelab (#35775)

dev/devicelab/bin/tasks/platform_channel_sample_test_swift.dart

diff --git a/dev/devicelab/bin/tasks/platform_channel_sample_test_swift.dart b/dev/devicelab/bin/tasks/platform_channel_sample_test_swift.dart
new file mode 100644
index 0000000..18a1d59
--- /dev/null
+++ b/dev/devicelab/bin/tasks/platform_channel_sample_test_swift.dart
@@ -0,0 +1,14 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:flutter_devicelab/framework/adb.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/tasks/integration_tests.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.ios;
+  await task(createPlatformChannelSwiftSampleTest());
+}

dev/devicelab/lib/tasks/integration_tests.dart

diff --git a/dev/devicelab/lib/tasks/integration_tests.dart b/dev/devicelab/lib/tasks/integration_tests.dart
index 116403e..a940a24 100644
--- a/dev/devicelab/lib/tasks/integration_tests.dart
+++ b/dev/devicelab/lib/tasks/integration_tests.dart
@@ -47,6 +47,13 @@
   );
 }
 
+TaskFunction createPlatformChannelSwiftSampleTest() {
+  return DriverTest(
+    '${flutterDirectory.path}/examples/platform_channel_swift',
+    'test_driver/button_tap.dart',
+  );
+}
+
 TaskFunction createEmbeddedAndroidViewsIntegrationTest() {
   return DriverTest(
     '${flutterDirectory.path}/dev/integration_tests/android_views',

dev/devicelab/manifest.yaml

diff --git a/dev/devicelab/manifest.yaml b/dev/devicelab/manifest.yaml
index 579508a..5cafc98 100644
--- a/dev/devicelab/manifest.yaml
+++ b/dev/devicelab/manifest.yaml
@@ -414,10 +414,17 @@
 
   platform_channel_sample_test_ios:
     description: >
-      Runs a driver test on the Platform Channel sample app on iPhone 6.
+      Runs a driver test on the Platform Channel sample app on iPhone 6 Objective-C project.
     stage: devicelab_ios
     required_agent_capabilities: ["mac/ios"]
 
+  platform_channel_sample_test_swift:
+    description: >
+      Runs a driver test on the Platform Channel sample app on iPhone 6 Swift project.
+    stage: devicelab_ios
+    required_agent_capabilities: ["mac/ios"]
+    flaky: true
+
   platform_view_ios__start_up:
     description: >
       Verifies that Platform View can be used from an iOS project.