Add textfield perf test to devicelab (flutter#51788)

Author: fluttergithubbot

dev/devicelab/bin/tasks/textfield_perf__timeline_summary.dart

@@ -0,0 +1,14 @@
+// Copyright 2014 The Flutter 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/tasks/perf_tests.dart';
+import 'package:flutter_devicelab/framework/adb.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.android;
+  await task(createTextfieldPerfTest());
+}

dev/devicelab/manifest.yaml

@@ -185,6 +185,12 @@ tasks:
     stage: devicelab
     required_agent_capabilities: ["mac/android"]
 
+  textfield_perf__timeline_summary:
+    description: >
+      Measures the runtime performance of textfield on Android.
+    stage: devicelab
+    required_agent_capabilities: ["mac/android"]
+
   flavors_test:
     description: >
       Checks that flavored builds work on Android.