Run and collect benchmarks (flutter#14556)

This will start to collect engine benchmarks in the flutter-cirrus
Datastore for all post-submit commits.

We're using this to test how https://github.com/liyuqian/metrics_center
works. Once it's stablized, we should move metrics_center into
flutter/packages, and migrate data to flutter-infra Datastore.

Related issue: flutter/flutter#37434

.cirrus.yml

@@ -19,6 +19,9 @@ task:
     FRAMEWORK_PATH: "/tmp/master_framework"
     PATH: "$FLUTTER_ENGINE/third_party/dart/tools/sdks/dart-sdk/bin:$DEPOT_TOOLS:$PATH"
     USE_ANDROID: "False"
+    # TODO(liyuqian): currently we're using flutter-cirrus GCP project. Migrate
+    # to flutter-infra project once the metrics_center service is stabilized,
+    BENCHMARK_GCP_CREDENTIALS: ENCRYPTED[da76d2b7b39894de70fae1fc9182c97cc41400adc93f0f1c49bc7442f15fb933da8d756ed88523810a9a77c34f51a693]
   setup_script: |
     git clone --depth 1 https://chromium.googlesource.com/chromium/tools/depot_tools.git $DEPOT_TOOLS
     mkdir -p $ENGINE_PATH/src
@@ -29,6 +32,18 @@ task:
     mv $CIRRUS_WORKING_DIR flutter
     gclient sync
   matrix:
+    - name: build_and_benchmark_linux_release
+      only_if: $CIRRUS_BRANCH == 'master' # Only run for post-submit commits.
+      compile_host_script: |
+        cd $ENGINE_PATH/src
+        ./flutter/tools/gn --runtime-mode=release
+        ninja -C out/host_release
+      benchmark_host_script: |
+        cd $ENGINE_PATH/src/out/host_release/
+        ./txt_benchmarks --benchmark_format=json > txt_benchmarks.json
+        cd $ENGINE_PATH/src/flutter/testing/benchmark
+        pub get
+        dart bin/parse_and_send.dart ../../../out/host_release/txt_benchmarks.json
     - name: build_and_test_linux_unopt_debug
       compile_host_script: |
         cd $ENGINE_PATH/src

testing/benchmark/.gitignore

@@ -0,0 +1 @@
+secret

testing/benchmark/README.md

@@ -0,0 +1,2 @@
+This is a Dart project that runs the engine benchmarks, and send the metrics to
+the cloud for storage and analysis.

testing/benchmark/bin/parse_and_send.dart

@@ -0,0 +1,54 @@
+// Copyright 2013 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:convert';
+import 'dart:io';
+
+import 'package:git/git.dart';
+import 'package:metrics_center/flutter.dart';
+import 'package:metrics_center/google_benchmark.dart';
+
+Future<String> _getGitRevision() async {
+  final GitDir gitDir = await GitDir.fromExisting('../../');
+  // Somehow gitDir.currentBranch() doesn't work in Cirrus with "fatal: 'HEAD' -
+  // not a valid ref". Therefore, we use "git log" to get the revision manually.
+  final ProcessResult logResult =
+      await gitDir.runCommand(<String>['log', '--pretty=format:%H', '-n', '1']);
+  if (logResult.exitCode != 0) {
+    throw 'Unexpected exit code ${logResult.exitCode}';
+  }
+  return logResult.stdout.toString();
+}
+
+Future<List<FlutterEngineMetricPoint>> _parse(String jsonFileName) async {
+  final String gitRevision = await _getGitRevision();
+  final List<MetricPoint> rawPoints =
+      await GoogleBenchmarkParser.parse(jsonFileName);
+  final List<FlutterEngineMetricPoint> points = <FlutterEngineMetricPoint>[];
+  for (MetricPoint rawPoint in rawPoints) {
+    points.add(FlutterEngineMetricPoint(
+      rawPoint.tags[kNameKey],
+      rawPoint.value,
+      gitRevision,
+      moreTags: rawPoint.tags,
+    ));
+  }
+  return points;
+}
+
+Future<void> main(List<String> args) async {
+  if (args.length != 1) {
+    throw 'Must have one argument: <benchmark_json_file>';
+  }
+  final List<FlutterEngineMetricPoint> points = await _parse(args[0]);
+  // The data will be sent to the Datastore of the GCP project specified through
+  // environment variable BENCHMARK_GCP_CREDENTIALS. The engine Cirrus job has
+  // currently configured the GCP project to flutter-cirrus for test. We'll
+  // eventually migrate to flutter-infra project once the test is done.
+  final FlutterDestination destination =
+      await FlutterDestination.makeFromCredentialsJson(
+    jsonDecode(Platform.environment['BENCHMARK_GCP_CREDENTIALS']),
+  );
+  await destination.update(points);
+}

testing/benchmark/example/txt_benchmarks.json

@@ -0,0 +1,32 @@
+{
+  "context": {
+    "date": "2019-12-17 15:14:14",
+    "num_cpus": 56,
+    "mhz_per_cpu": 2594,
+    "cpu_scaling_enabled": true,
+    "library_build_type": "release"
+  },
+  "benchmarks": [
+    {
+      "name": "BM_PaintRecordInit",
+      "iterations": 6749079,
+      "real_time": 101,
+      "cpu_time": 101,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_ParagraphShortLayout",
+      "iterations": 151761,
+      "real_time": 4460,
+      "cpu_time": 4460,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_ParagraphStylesBigO_BigO",
+      "cpu_coefficient": 6548,
+      "real_coefficient": 6548,
+      "big_o": "N",
+      "time_unit": "ns"
+    }
+  ]
+}

testing/benchmark/pubspec.yaml

@@ -0,0 +1,15 @@
+name: flutter_engine_benchmark
+
+dependencies:
+  git: any
+  metrics_center:
+    # TODO(liyuqian): once metrics_center is properly reviewed, add it to
+    # flutter/packages, publish on pub.dev, and use the published package here.
+    git: https://github.com/liyuqian/metrics_center.git
+
+dev_dependencies:
+  test: any
+  pedantic: ^1.8.0
+
+environment:
+  sdk: ">=2.2.2 <3.0.0"

testing/benchmark/test/parse_and_send_test.dart

@@ -0,0 +1,24 @@
+// Copyright 2013 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:io';
+
+import 'package:test/test.dart';
+
+void main() {
+  // In order to run this test, one should download a service account
+  // credentials json from a test GCP project, and put that json as
+  // `secret/test_gcp_credentials.json`. There's a `flutter-test` project for
+  // Flutter team members.
+  test('parse_and_send with example json does not crash.', () async {
+    final String testCred =
+        File('secret/test_gcp_credentials.json').readAsStringSync();
+    Process.runSync('dart', <String>[
+      'bin/parse_and_send.dart',
+      'example/txt_benchmarks.json',
+    ], environment: <String, String>{
+      'BENCHMARK_GCP_CREDENTIALS': testCred,
+    });
+  });
+}