increase total task timeout; decrease individual benchmark timeout (#9063)

dev/devicelab/lib/framework/framework.dart

@@ -16,7 +16,7 @@ import 'utils.dart';
 /// Maximum amount of time a single task is allowed to take to run.
 ///
 /// If exceeded the task is considered to have failed.
-const Duration taskTimeout = const Duration(minutes: 10);
+const Duration taskTimeout = const Duration(minutes: 25);
 
 /// Represents a unit of work performed in the CI environment that can
 /// succeed, fail and be retried independently of others.

dev/devicelab/lib/framework/runner.dart

@@ -12,7 +12,7 @@ import 'package:flutter_devicelab/framework/utils.dart';
 
 /// Slightly longer than task timeout that gives the task runner a chance to
 /// clean-up before forcefully quitting it.
-const Duration taskTimeoutWithGracePeriod = const Duration(minutes: 11);
+const Duration taskTimeoutWithGracePeriod = const Duration(minutes: 26);
 
 /// Runs a task in a separate Dart VM and collects the result using the VM
 /// service protocol.

dev/devicelab/lib/tasks/microbenchmarks.dart

@@ -13,6 +13,9 @@ import 'package:flutter_devicelab/framework/framework.dart';
 import 'package:flutter_devicelab/framework/ios.dart';
 import 'package:flutter_devicelab/framework/utils.dart';
 
+/// The maximum amount of time a single microbenchmarks is allowed to take.
+const Duration _kBenchmarkTimeout = const Duration(minutes: 6);
+
 /// Creates a device lab task that runs benchmarks in
 /// `dev/benchmarks/microbenchmarks` reports results to the dashboard.
 TaskFunction createMicrobenchmarkTask() {
@@ -21,15 +24,18 @@ TaskFunction createMicrobenchmarkTask() {
     await device.unlock();
 
     Future<Map<String, double>> _runMicrobench(String benchmarkPath) async {
+      Future<Map<String, double>> _run() async {
         print('Running $benchmarkPath');
-      final Directory appDir = dir(path.join(flutterDirectory.path, 'dev/benchmarks/microbenchmarks'));
+        final Directory appDir = dir(
+            path.join(flutterDirectory.path, 'dev/benchmarks/microbenchmarks'));
         final Process flutterProcess = await inDirectory(appDir, () async {
           if (deviceOperatingSystem == DeviceOperatingSystem.ios) {
             await prepareProvisioningCertificates(appDir.path);
           }
           return await _startFlutter(
             options: <String>[
-            '--profile',  // --release doesn't work on iOS due to code signing issues
+              '--profile',
+              // --release doesn't work on iOS due to code signing issues
               '-d',
               device.deviceId,
               benchmarkPath,
@@ -40,6 +46,8 @@ TaskFunction createMicrobenchmarkTask() {
 
         return await _readJsonResults(flutterProcess);
       }
+      return _run().timeout(_kBenchmarkTimeout);
+    }
 
     final Map<String, double> allResults = <String, double>{};
     allResults.addAll(await _runMicrobench('lib/stocks/layout_bench.dart'));