Adds benchmark for rrect_blur. (flutter#149261)

issue: flutter#148496

![rrectblurbenchmark (2)](https://github.com/flutter/flutter/assets/30870216/ec849519-4619-4c2f-8bb3-8e0584c4566f)
(I slightly tweaked the animation to make sure the large radius blurs aren't always at the bottom of the screen).

.ci.yaml

@@ -3234,6 +3234,28 @@ targets:
         ["devicelab", "ios", "mac"]
       task_name: animated_advanced_blend_perf_ios__timeline_summary
 
+  # Uses Impeller.
+  - name: Linux_pixel_7pro rrect_blur_perf__timeline_summary
+    recipe: devicelab/devicelab_drone
+    presubmit: false
+    bringup: true
+    timeout: 60
+    properties:
+      ignore_flakiness: "true"
+      tags: >
+        ["devicelab", "android", "linux", "pixel", "7pro"]
+      task_name: rrect_blur_perf__timeline_summary
+
+  - name: Mac_ios rrect_blur_perf_ios__timeline_summary
+    recipe: devicelab/devicelab_drone
+    presubmit: false
+    bringup: true
+    timeout: 60
+    properties:
+      tags: >
+        ["devicelab", "ios", "mac"]
+      task_name: rrect_blur_perf_ios__timeline_summary
+
   # Uses Impeller.
   - name: Linux_pixel_7pro animated_blur_backdrop_filter_perf_opengles__timeline_summary
     recipe: devicelab/devicelab_drone

TESTOWNERS

@@ -106,6 +106,7 @@
 /dev/devicelab/bin/tasks/dynamic_path_tessellation_perf__timeline_summary.dart @jonahwilliams @flutter/engine
 /dev/devicelab/bin/tasks/complex_layout_scroll_perf_impeller__timeline_summary.dart @jonahwilliams @flutter/engine
 /dev/devicelab/bin/tasks/complex_layout_scroll_perf_impeller_gles__timeline_summary.dart @jonahwilliams @flutter/engine
+/dev/devicelab/bin/tasks/rrect_blur_perf__timeline_summary.dart @gaaclarke @flutter/engine
 
 ## Windows Android DeviceLab tests
 /dev/devicelab/bin/tasks/basic_material_app_win__compile.dart @zanderso @flutter/tool
@@ -223,6 +224,7 @@
 /dev/devicelab/bin/tasks/draw_atlas_perf_ios__timeline_summary.dart @jonahwilliams @flutter/engine
 /dev/devicelab/bin/tasks/static_path_tessellation_perf_ios__timeline_summary.dart @jonahwilliams @flutter/engine
 /dev/devicelab/bin/tasks/dynamic_path_tessellation_perf_ios__timeline_summary.dart @jonahwilliams @flutter/engine
+/dev/devicelab/bin/tasks/rrect_blur_perf_ios__timeline_summary.dart @gaaclarke @flutter/engine
 
 ## Host only DeviceLab tests
 /dev/devicelab/bin/tasks/animated_complex_opacity_perf_macos__e2e_summary.dart @cbracken @flutter/desktop

dev/benchmarks/macrobenchmarks/lib/common.dart

@@ -41,6 +41,7 @@ const String kDrawPointsPageRougeName = '/draw_points';
 const String kDrawVerticesPageRouteName = '/draw_vertices';
 const String kDrawAtlasPageRouteName = '/draw_atlas';
 const String kAnimatedAdvancedBlend = '/animated_advanced_blend';
+const String kRRectBlurRouteName = '/rrect_blur';
 
 const String kOpacityPeepholeOneRectRouteName = '$kOpacityPeepholeRouteName/one_big_rect';
 const String kOpacityPeepholeColumnOfOpacityRouteName = '$kOpacityPeepholeRouteName/column_of_opacity';

dev/benchmarks/macrobenchmarks/lib/main.dart

@@ -36,6 +36,7 @@ import 'src/picture_cache.dart';
 import 'src/picture_cache_complexity_scoring.dart';
 import 'src/post_backdrop_filter.dart';
 import 'src/raster_cache_use_memory.dart';
+import 'src/rrect_blur.dart' show RRectBlur;
 import 'src/shader_mask_cache.dart';
 import 'src/simple_animation.dart';
 import 'src/simple_scroll.dart';
@@ -98,6 +99,7 @@ class MacrobenchmarksApp extends StatelessWidget {
         kDrawVerticesPageRouteName: (BuildContext context) => const DrawVerticesPage(),
         kDrawAtlasPageRouteName: (BuildContext context) => const DrawAtlasPage(),
         kAnimatedAdvancedBlend: (BuildContext context) => const AnimatedAdvancedBlend(),
+        kRRectBlurRouteName: (BuildContext context) => const RRectBlur(),
         kVeryLongPictureScrollingRouteName: (BuildContext context) => const VeryLongPictureScrollingPerf(),
       },
     );
@@ -375,6 +377,13 @@ class HomePage extends StatelessWidget {
               Navigator.pushNamed(context, kAnimatedAdvancedBlend);
             },
           ),
+          ElevatedButton(
+            key: const Key(kRRectBlurRouteName),
+            child: const Text('Rounded Rect Blur'),
+            onPressed: () {
+              Navigator.pushNamed(context, kRRectBlurRouteName);
+            },
+          ),
           ElevatedButton(
             key: const Key(kVeryLongPictureScrollingRouteName),
             child: const Text('Very Long Picture Scrolling'),

dev/benchmarks/macrobenchmarks/lib/src/rrect_blur.dart

@@ -0,0 +1,99 @@
+// 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:math' show cos, sin;
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+
+class RRectBlur extends StatefulWidget {
+  const RRectBlur({super.key});
+
+  @override
+  State<RRectBlur> createState() => _DrawPointsPageState();
+}
+
+class _DrawPointsPageState extends State<RRectBlur>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController controller;
+  double tick = 0.0;
+
+  @override
+  void initState() {
+    super.initState();
+    controller =
+        AnimationController(vsync: this, duration: const Duration(hours: 1));
+    controller.addListener(() {
+      setState(() {
+        tick += 1;
+      });
+    });
+    controller.forward(from: 0);
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return CustomPaint(
+      size: const Size(500, 500),
+      painter: PointsPainter(tick),
+      child: Container(),
+    );
+  }
+}
+
+class PointsPainter extends CustomPainter {
+  PointsPainter(this.tick);
+
+  final double tick;
+
+  final Float32List data = Float32List(8000);
+
+  static const List<Color> kColors = <Color>[
+    Colors.red,
+    Colors.blue,
+    Colors.green,
+    Colors.yellow,
+    Colors.orange,
+    Colors.purple,
+    Colors.pink,
+    Colors.deepPurple,
+  ];
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    if (size.width == 0) {
+      return;
+    }
+    final double halfHeight = size.height / 2.0;
+    const double freq = 0.25;
+    for (int i = 0; i < size.width / 10; ++i) {
+      final double radius =
+          25 * cos(i + (1.0 * 2.0 * 3.1415 * tick) / 60.0) +
+              25;
+      final Paint paint = Paint()
+        ..style = PaintingStyle.fill
+        ..filterQuality = FilterQuality.low
+        ..maskFilter = MaskFilter.blur(BlurStyle.normal, radius);
+      final double yval =
+          halfHeight * sin(i + (freq * 2.0 * 3.1415 * tick) / 60.0) +
+              halfHeight;
+      canvas.drawCircle(
+        Offset(10.0 * i, yval),
+        50,
+        paint..color = kColors[i % kColors.length],
+      );
+    }
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) {
+    return true;
+  }
+}

dev/benchmarks/macrobenchmarks/test_driver/rrect_blur_perf_test.dart

@@ -0,0 +1,16 @@
+// 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:macrobenchmarks/common.dart';
+
+import 'util.dart';
+
+void main() {
+  macroPerfTest(
+    'rrect_blur_perf',
+    kRRectBlurRouteName,
+    pageDelay: const Duration(seconds: 1),
+    duration: const Duration(seconds: 10),
+  );
+}

dev/devicelab/bin/tasks/rrect_blur_perf__timeline_summary.dart

@@ -0,0 +1,14 @@
+// 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/devices.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/tasks/perf_tests.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.android;
+  await task(createRRectBlurPerfTest(enableImpeller: true));
+}

dev/devicelab/bin/tasks/rrect_blur_perf_ios__timeline_summary.dart

@@ -0,0 +1,14 @@
+// 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/devices.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/tasks/perf_tests.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.ios;
+  await task(createRRectBlurPerfTest(enableImpeller: true));
+}

dev/devicelab/lib/tasks/perf_tests.dart

@@ -666,6 +666,21 @@ TaskFunction createAnimatedAdvancedBlendPerfTest({
   ).run;
 }
 
+TaskFunction createRRectBlurPerfTest({
+  bool? enableImpeller,
+  bool? forceOpenGLES,
+}) {
+  return PerfTest(
+    '${flutterDirectory.path}/dev/benchmarks/macrobenchmarks',
+    'test_driver/run_app.dart',
+    'rrect_blur_test',
+    enableImpeller: enableImpeller,
+    forceOpenGLES: forceOpenGLES,
+    testDriver: 'test_driver/rrect_blur_perf_test.dart',
+    saveTraceFile: true,
+  ).run;
+}
+
 TaskFunction createAnimatedBlurBackropFilterPerfTest({
   bool? enableImpeller,
   bool? forceOpenGLES,