Revert "Add DevTools memory test (#55486)" (#56445)

This reverts commit 9ee6763a.

dev/devicelab/bin/tasks/complex_layout_scroll_perf__devtools_memory.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 'dart:async';
-
-import 'package:flutter_devicelab/framework/adb.dart';
-import 'package:flutter_devicelab/framework/framework.dart';
-import 'package:flutter_devicelab/framework/utils.dart';
-import 'package:flutter_devicelab/tasks/perf_tests.dart';
-
-Future<void> main() async {
-  deviceOperatingSystem = DeviceOperatingSystem.android;
-  await task(DevToolsMemoryTest(
-    '${flutterDirectory.path}/dev/benchmarks/complex_layout',
-    'test_driver/scroll_perf.dart',
-  ).run);
-}

dev/devicelab/lib/tasks/perf_tests.dart

@@ -3,9 +3,8 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:convert' show LineSplitter, json, utf8;
+import 'dart:convert' show json;
 import 'dart:io';
-import 'dart:math' as math;
 
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as path;
@@ -693,129 +692,6 @@ class MemoryTest {
   }
 }
 
-class DevToolsMemoryTest {
-  DevToolsMemoryTest(this.project, this.driverTest);
-
-  final String project;
-  final String driverTest;
-
-  Future<TaskResult> run() {
-    return inDirectory<TaskResult>(project, () async {
-      _device = await devices.workingDevice;
-      await _device.unlock();
-      await flutter('packages', options: <String>['get']);
-
-      await _launchApp();
-      if (_observatoryUri == null) {
-        return  TaskResult.failure('Observatory URI not found.');
-      }
-
-      await _launchDevTools();
-
-      await flutter(
-        'drive',
-        options: <String>[
-          '--use-existing-app', _observatoryUri,
-          '-d', _device.deviceId,
-          '--profile',
-          driverTest,
-        ],
-      );
-
-      _devToolsProcess.kill();
-      await _devToolsProcess.exitCode;
-
-      _runProcess.kill();
-      await _runProcess.exitCode;
-
-      final Map<String, dynamic> data = json.decode(
-        file('$project/$_kJsonFileName').readAsStringSync(),
-      ) as Map<String, dynamic>;
-      final List<dynamic> samples = data['samples']['data'] as List<dynamic>;
-      int maxRss = 0;
-      int maxAdbTotal = 0;
-      for (final dynamic sample in samples) {
-        maxRss = math.max(maxRss, sample['rss'] as int);
-        if (sample['adb_memoryInfo'] != null) {
-          maxAdbTotal = math.max(maxAdbTotal, sample['adb_memoryInfo']['Total'] as int);
-        }
-      }
-      return TaskResult.success(
-          <String, dynamic>{'maxRss': maxRss, 'maxAdbTotal': maxAdbTotal},
-          benchmarkScoreKeys: <String>['maxRss', 'maxAdbTotal'],
-      );
-    });
-  }
-
-  Future<void> _launchApp() async {
-    print('launching $project$driverTest on device...');
-    final String flutterPath = path.join(flutterDirectory.path, 'bin', 'flutter');
-    _runProcess = await startProcess(
-      flutterPath,
-      <String>[
-        'run',
-        '--verbose',
-        '--profile',
-        '-d', _device.deviceId,
-        driverTest,
-      ],
-    );
-
-    // Listen for Observatory URI and forward stdout/stderr
-    final Completer<String> observatoryUri = Completer<String>();
-    _runProcess.stdout
-        .transform<String>(utf8.decoder)
-        .transform<String>(const LineSplitter())
-        .listen((String line) {
-          print('run stdout: $line');
-          final RegExpMatch match = RegExp(r'An Observatory debugger and profiler on .+ is available at: ((http|//)[a-zA-Z0-9:/=_\-\.\[\]]+)').firstMatch(line);
-          if (match != null) {
-            observatoryUri.complete(match[1]);
-            _observatoryUri = match[1];
-          }
-        }, onDone: () { observatoryUri.complete(null); });
-    _forwardStream(_runProcess.stderr, 'run stderr');
-
-    _observatoryUri = await observatoryUri.future;
-  }
-
-  Future<void> _launchDevTools() async {
-    await exec('pub', <String>[
-      'global',
-      'activate',
-      'devtools',
-    ]);
-    _devToolsProcess = await startProcess(
-      'pub',
-      <String>[
-        'global',
-        'run',
-        'devtools',
-        '--vm-uri', _observatoryUri,
-        '--profile-memory', _kJsonFileName,
-      ],
-    );
-    _forwardStream(_devToolsProcess.stdout, 'devtools stdout');
-    _forwardStream(_devToolsProcess.stderr, 'devtools stderr');
-  }
-
-  void _forwardStream(Stream<List<int>> stream, String label) {
-    stream
-        .transform<String>(utf8.decoder)
-        .transform<String>(const LineSplitter())
-        .listen((String line) {
-          print('$label: $line');
-        });
-  }
-
-  Device _device;
-  String _observatoryUri;
-  Process _runProcess;
-  Process _devToolsProcess;
-
-  static const String _kJsonFileName = 'devtools_memory.json';
-}
-
 enum ReportedDurationTestFlavor {
   debug, profile, release
 }

dev/devicelab/manifest.yaml

@@ -285,12 +285,6 @@ tasks:
     stage: devicelab
     required_agent_capabilities: ["mac/android"]
 
-  complex_layout_scroll_perf__devtools_memory:
-    description: >
-      Measures memory usage of the scroll performance test using DevTools.
-    stage: devicelab
-    required_agent_capabilities: ["linux/android"]
-
   hello_world_android__compile:
     description: >
       Measures the APK size of Hello World.