Add plumbing for hello world startup test in devicelab (#36410)

This is the first step in getting esoteric devices wired
up to device lab to ensure that we can at least start Flutter
apps in profile mode on such devices.

https://github.com/flutter/flutter/issues/35838

dev/devicelab/bin/tasks/hello_world__start_up.dart

+// Copyright 2016 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/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(createHelloWorldStartupTest());
+}

dev/devicelab/lib/tasks/perf_tests.dart

@@ -74,6 +74,13 @@ TaskFunction createComplexLayoutStartupTest() {
   ).run;
 }
 
+TaskFunction createHelloWorldStartupTest() {
+  return StartupTest(
+    '${flutterDirectory.path}/examples/hello_world',
+    reportMetrics: false,
+  ).run;
+}
+
 TaskFunction createFlutterGalleryCompileTest() {
   return CompileTest('${flutterDirectory.path}/examples/flutter_gallery').run;
 }

dev/devicelab/manifest.yaml

@@ -277,6 +277,12 @@ tasks:
     stage: devicelab
     required_agent_capabilities: ["mac/android"]
 
+  # hello_world__start_up:
+  #   description: >
+  #     Verifies that Hello World can start on an array of devices.
+  #   stage: devicelab
+  #   required_agent_capabilities: ["linux/android_esoteric"]
+
   microbenchmarks:
     description: >
       Runs benchmarks from dev/benchmarks/microbenchmarks.