Reverts "Reland Add UI Benchmarks (#143542) (#143799)" (#143946)

Reverts flutter/flutter#143799

Initiated by: goderbauer

Reason for reverting: The microbenchmark failed two run two times in a row after this was committed (see https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8755379171959141089/+/u/run_microbenchmarks/stdout).

Original PR Author: bernaferrari

Reviewed By: {goderbauer}

This change reverts the following previous change:
Original Description:
Re-lands https://github.com/flutter/flutter/pull/143542 (which is part 1 of https://github.com/flutter/flutter/pull/138481)

The filename was wrong 🫠

dev/benchmarks/microbenchmarks/lib/foundation/observer_list_bench.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/animation.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import '../common.dart';
-
-const int _kNumIterationsList = 2 << 14;
-const int _kNumIterationsHashed = 2 << 19;
-const int _kNumWarmUp = 2 << 6;
-const List<int> callbackCounts = <int>[1, 10, 100, 500];
-
-class TestAnimationController extends AnimationController {
-  TestAnimationController() : super(vsync: const TestVSync());
-
-  @override
-  void notifyListeners() => super.notifyListeners();
-}
-
-void main() {
-  assert(false,
-      "Don't run benchmarks in debug mode! Use 'flutter run --release'.");
-
-  final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
-
-  void runNotifiyListenersLoopWithObserverList(
-    int totalIterations, {
-    bool failRemoval = false,
-    bool addResult = true,
-  }) {
-    final String suffix = failRemoval ? 'removalFail' : 'removalSuccess';
-    final String name = 'notifyListeners:ObserverList:$suffix';
-
-    void miss() {}
-
-    for (final int callbackCount in callbackCounts) {
-      final int iterations = totalIterations ~/ callbackCount;
-
-      final ObserverList<VoidCallback> observerList =
-          ObserverList<VoidCallback>();
-      for (int i = 0; i < callbackCount; ++i) {
-        observerList.add(
-          switch (failRemoval) {
-            false => () {
-                final VoidCallback first =
-                    (observerList.iterator..moveNext()).current;
-
-                observerList.remove(first);
-                observerList.add(first);
-              },
-            true => () => observerList.remove(miss),
-          },
-        );
-      }
-
-      final Stopwatch watch = Stopwatch()..start();
-
-      for (int i = 0; i < iterations; ++i) {
-        final List<VoidCallback> list = observerList.toList(growable: false);
-        for (final VoidCallback cb in list) {
-          if (observerList.contains(cb)) {
-            cb();
-          }
-        }
-      }
-
-      watch.stop();
-
-      if (addResult) {
-        printer.addResult(
-          description: '$name ($callbackCount callbacks)',
-          value: watch.elapsedMicroseconds / iterations,
-          unit: 'µs per iteration',
-          name: '$name$callbackCount',
-        );
-      }
-    }
-  }
-
-  void runNotifiyListenersLoopWithHashedObserverList(
-    int totalIterations, {
-    bool addResult = true,
-  }) {
-    const String name = 'notifyListeners:HashedObserverList';
-
-    for (final int callbackCount in callbackCounts) {
-      final int iterations = totalIterations ~/ callbackCount;
-
-      final HashedObserverList<VoidCallback> observerList =
-          HashedObserverList<VoidCallback>();
-      for (int i = 0; i < callbackCount; ++i) {
-        observerList.add(() {
-          final VoidCallback first =
-              (observerList.iterator..moveNext()).current;
-
-          observerList.remove(first);
-          observerList.add(first);
-        });
-      }
-
-      final Stopwatch watch = Stopwatch()..start();
-
-      for (int i = 0; i < iterations; ++i) {
-        final List<VoidCallback> list = observerList.toList(growable: false);
-        for (final VoidCallback cb in list) {
-          if (observerList.contains(cb)) {
-            cb();
-          }
-        }
-      }
-
-      watch.stop();
-
-      if (addResult) {
-        printer.addResult(
-          description: '$name ($callbackCount callbacks)',
-          value: watch.elapsedMicroseconds / iterations,
-          unit: 'µs per iteration',
-          name: '$name$callbackCount',
-        );
-      }
-    }
-  }
-
-  void runNotifiyListenersLoopWithAnimationController(
-    int totalIterations, {
-    bool addResult = true,
-  }) {
-    const String name = 'notifyListeners:AnimationController';
-
-    for (final int callbackCount in callbackCounts) {
-      final int iterations = totalIterations ~/ callbackCount;
-
-      final TestAnimationController controller = TestAnimationController();
-      for (int i = 0; i < callbackCount; ++i) {
-        late final VoidCallback cb;
-        cb = () {
-          controller.removeListener(cb);
-          controller.addListener(cb);
-        };
-        controller.addListener(cb);
-      }
-
-      final Stopwatch watch = Stopwatch()..start();
-
-      for (int i = 0; i < iterations; ++i) {
-        controller.notifyListeners();
-      }
-
-      watch.stop();
-
-      if (addResult) {
-        printer.addResult(
-          description: '$name ($callbackCount callbacks)',
-          value: watch.elapsedMicroseconds / iterations,
-          unit: 'µs per iteration',
-          name: '$name$callbackCount',
-        );
-      }
-    }
-  }
-
-  runNotifiyListenersLoopWithObserverList(_kNumWarmUp, addResult: false);
-  runNotifiyListenersLoopWithObserverList(_kNumIterationsList);
-
-  runNotifiyListenersLoopWithObserverList(_kNumWarmUp,
-      failRemoval: true, addResult: false);
-  runNotifiyListenersLoopWithObserverList(_kNumIterationsList,
-      failRemoval: true);
-
-  runNotifiyListenersLoopWithHashedObserverList(_kNumWarmUp, addResult: false);
-  runNotifiyListenersLoopWithHashedObserverList(_kNumIterationsHashed);
-
-  runNotifiyListenersLoopWithAnimationController(_kNumWarmUp, addResult: false);
-  runNotifiyListenersLoopWithAnimationController(_kNumIterationsHashed);
-
-  printer.printToStdout();
-}

dev/devicelab/lib/tasks/microbenchmarks.dart

@@ -57,7 +57,6 @@ TaskFunction createMicrobenchmarkTask({
       ...await runMicrobench('lib/foundation/all_elements_bench.dart'),
       ...await runMicrobench('lib/foundation/change_notifier_bench.dart'),
       ...await runMicrobench('lib/foundation/clamp.dart'),
-      ...await runMicrobench('lib/foundation/observer_list_bench.dart'),
       ...await runMicrobench('lib/foundation/platform_asset_bundle.dart'),
       ...await runMicrobench('lib/foundation/standard_message_codec_bench.dart'),
       ...await runMicrobench('lib/foundation/standard_method_codec_bench.dart'),