Add benchmarks for single-threaded Skwasm. (#158027)

This adds benchmarks that run on single threaded skwasm.

.ci.yaml

@@ -1554,6 +1554,25 @@ targets:
       - bin/**
       - .ci.yaml
 
+  - name: Linux web_benchmarks_skwasm_st
+    recipe: devicelab/devicelab_drone
+    bringup: true
+    presubmit: false
+    timeout: 60
+    properties:
+      dependencies: >-
+        [
+          {"dependency": "android_sdk", "version": "version:35v1"},
+          {"dependency": "chrome_and_driver", "version": "version:125.0.6422.141"}
+        ]
+      tags: >
+        ["devicelab"]
+      task_name: web_benchmarks_skwasm_st
+    runIf:
+      - dev/**
+      - bin/**
+      - .ci.yaml
+
   - name: Linux web_long_running_tests_1_5
     recipe: flutter/flutter_drone
     timeout: 60

TESTOWNERS

@@ -292,6 +292,7 @@
 /dev/devicelab/bin/tasks/web_benchmarks_canvaskit.dart @yjbanov @flutter/web
 /dev/devicelab/bin/tasks/web_benchmarks_html.dart @yjbanov @flutter/web
 /dev/devicelab/bin/tasks/web_benchmarks_skwasm.dart @eyebrowsoffire @flutter/web
+/dev/devicelab/bin/tasks/web_benchmarks_skwasm_st.dart @eyebrowsoffire @flutter/web
 /dev/devicelab/bin/tasks/windows_home_scroll_perf__timeline_summary.dart @jonahwilliams @flutter/engine
 /dev/devicelab/bin/tasks/windows_startup_test.dart @loic-sharma @flutter/desktop
 /dev/devicelab/bin/tasks/windows_desktop_impeller.dart @jonahwilliams @flutter/engine

dev/benchmarks/macrobenchmarks/web/flutter_bootstrap.js

@@ -1,8 +1,13 @@
 {{flutter_js}}
 {{flutter_build_config}}
+
+const searchParams = new URLSearchParams(window.location.search);
+const forceSt = searchParams.get('force_st');
+const extraConfig = forceSt ? {forceSingleThreadedSkwasm: true} : {};
 _flutter.loader.load({
   config: {
     // Use the local CanvasKit bundle instead of the CDN to reduce test flakiness.
     canvasKitBaseUrl: "/canvaskit/",
+    ...extraConfig,
   },
 });

dev/devicelab/bin/tasks/web_benchmarks_canvaskit.dart

@@ -10,7 +10,8 @@ Future<void> main() async {
   await task(() async {
     return runWebBenchmark((
       webRenderer: 'canvaskit',
-      useWasm: false
+      useWasm: false,
+      forceSingleThreadedSkwasm: false,
     ));
   });
 }

dev/devicelab/bin/tasks/web_benchmarks_html.dart

@@ -10,7 +10,8 @@ Future<void> main() async {
   await task(() async {
     return runWebBenchmark((
       webRenderer: 'html',
-      useWasm: false
+      useWasm: false,
+      forceSingleThreadedSkwasm: false,
     ));
   });
 }

dev/devicelab/bin/tasks/web_benchmarks_skwasm.dart

@@ -10,7 +10,8 @@ Future<void> main() async {
   await task(() async {
     return runWebBenchmark((
       webRenderer: 'skwasm',
-      useWasm: true
+      useWasm: true,
+      forceSingleThreadedSkwasm: false,
     ));
   });
 }

dev/devicelab/bin/tasks/web_benchmarks_skwasm_st.dart

@@ -0,0 +1,17 @@
+// 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/framework.dart';
+import 'package:flutter_devicelab/tasks/web_benchmarks.dart';
+
+/// Runs all Web benchmarks using the Skwasm rendering backend.
+Future<void> main() async {
+  await task(() async {
+    return runWebBenchmark((
+      webRenderer: 'skwasm',
+      useWasm: true,
+      forceSingleThreadedSkwasm: true,
+    ));
+  });
+}

dev/devicelab/lib/tasks/web_benchmarks.dart

@@ -23,6 +23,7 @@ const int chromeDebugPort = 10000;
 typedef WebBenchmarkOptions = ({
   String webRenderer,
   bool useWasm,
+  bool forceSingleThreadedSkwasm,
 });
 
 Future<TaskResult> runWebBenchmark(WebBenchmarkOptions benchmarkOptions) async {
@@ -142,8 +143,9 @@ Future<TaskResult> runWebBenchmark(WebBenchmarkOptions benchmarkOptions) async {
       final bool isUncalibratedSmokeTest = io.Platform.environment['CALIBRATED'] != 'true';
       // final bool isUncalibratedSmokeTest =
       //     io.Platform.environment['UNCALIBRATED_SMOKE_TEST'] == 'true';
+      final String urlParams = benchmarkOptions.forceSingleThreadedSkwasm ? '?force_st=true' : '';
       final ChromeOptions options = ChromeOptions(
-        url: 'http://localhost:$benchmarkServerPort/index.html',
+        url: 'http://localhost:$benchmarkServerPort/index.html$urlParams',
         userDataDirectory: userDataDir,
         headless: isUncalibratedSmokeTest,
         debugPort: chromeDebugPort,
@@ -171,7 +173,13 @@ Future<TaskResult> runWebBenchmark(WebBenchmarkOptions benchmarkOptions) async {
           throw 'Benchmark name is empty';
         }
 
-        final String namespace = '$benchmarkName.${benchmarkOptions.webRenderer}';
+        final String webRendererName;
+        if (benchmarkOptions.useWasm && benchmarkOptions.forceSingleThreadedSkwasm) {
+          webRendererName = 'skwasm_st';
+        } else {
+          webRendererName = benchmarkOptions.webRenderer;
+        }
+        final String namespace = '$benchmarkName.$webRendererName';
         final List<String> scoreKeys = List<String>.from(profile['scoreKeys'] as List<dynamic>);
         if (scoreKeys.isEmpty) {
           throw 'No score keys in benchmark "$benchmarkName"';