Revert "Delete fast start unit test (#67757)" (#67763)

This reverts commit 3eb2335a.

dev/devicelab/bin/tasks/gradle_fast_start_test.dart

+// 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 'package:flutter_devicelab/framework/apk_utils.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/framework/task_result.dart';
+import 'package:flutter_devicelab/framework/utils.dart';
+
+Future<void> main() async {
+  await task(() async {
+    try {
+      await runPluginProjectTest((FlutterPluginProject pluginProject) async {
+        section('APK content for task assembleDebug with --fast-start');
+        await pluginProject.runGradleTask('assembleDebug',
+            options: <String>['-Pfast-start=true']);
+
+        final Iterable<String> apkFiles = await getFilesInApk(pluginProject.debugApkPath);
+
+        checkCollectionContains<String>(<String>[
+          ...debugAssets,
+          ...baseApkFiles,
+          'lib/x86/libflutter.so',
+          'lib/x86_64/libflutter.so',
+          'lib/armeabi-v7a/libflutter.so',
+          'lib/arm64-v8a/libflutter.so',
+        ], apkFiles);
+
+        checkCollectionDoesNotContain<String>(<String>[
+          ...flutterAssets,
+        ], apkFiles);
+      });
+
+      return TaskResult.success(null);
+    } on TaskResult catch (taskResult) {
+      return taskResult;
+    } catch (e) {
+      return TaskResult.failure(e.toString());
+    }
+  });
+}

dev/prod_builders.json

@@ -60,6 +60,12 @@
          "task_name": "linux_fuchsia_precache",
          "flaky": false
       },
+      {
+         "name": "Linux gradle_fast_start_test",
+         "repo": "flutter",
+         "task_name": "linux_gradle_fast_start_test",
+         "flaky": false
+      },
       {
          "name": "Linux gradle_jetifier_test",
          "repo": "flutter",
@@ -180,6 +186,12 @@
          "task_name": "mac_framework_tests",
          "flaky": false
       },
+      {
+         "name": "Mac gradle_fast_start_test",
+         "repo": "flutter",
+         "task_name": "mac_gradle_fast_start_test",
+         "flaky": false
+      },
       {
          "name": "Mac gradle_jetifier_test",
          "repo": "flutter",
@@ -288,6 +300,12 @@
          "task_name": "win_framework_tests",
          "flaky": false
       },
+      {
+         "name": "Windows gradle_fast_start_test",
+         "repo": "flutter",
+         "task_name": "win_gradle_fast_start_test",
+         "flaky": false
+      },
       {
          "name": "Windows gradle_jetifier_test",
          "repo": "flutter",

dev/try_builders.json

@@ -63,6 +63,13 @@
          "task_name":"linux_fuchsia_precache",
          "enabled":true
       },
+      {
+         "name":"Linux gradle_fast_start_test",
+         "repo":"flutter",
+         "task_name":"linux_gradle_fast_start_test",
+         "enabled":true,
+         "run_if": ["dev/**", "bin/**"]
+      },
       {
          "name":"Linux gradle_jetifier_test",
          "repo":"flutter",
@@ -207,6 +214,13 @@
          "enabled":true,
          "run_if":["dev/**", "packages/flutter/**", "packages/flutter_goldens/**", "packages/flutter_goldens_client/**", "packages/flutter_test/**", "packages/flutter_tools/lib/src/test/**", "bin/**"]
       },
+      {
+         "name":"Mac gradle_fast_start_test",
+         "repo":"flutter",
+         "task_name":"mac_gradle_fast_start_test",
+         "enabled":true,
+         "run_if":["dev/**", "bin/**"]
+      },
       {
          "name":"Mac gradle_jetifier_test",
          "repo":"flutter",
@@ -331,6 +345,13 @@
          "enabled":true,
          "run_if":["dev/", "packages/flutter/", "packages/flutter_test/", "packages/flutter_goldens/", "packages/flutter_tools/lib/src/test/", "bin/"]
       },
+      {
+         "name": "Windows gradle_fast_start_test",
+         "repo": "flutter",
+         "task_name": "win_gradle_fast_start_test",
+         "enabled":true,
+         "run_if":["dev/**", "bin/**"]
+      },
       {
          "name": "Windows gradle_jetifier_test",
          "repo": "flutter",