Add device ready check (#135526)

*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*

*List which issues are fixed by this PR. You must list at least one issue.*
Fixes flutter/flutter#121420

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

dev/devicelab/lib/framework/devices.dart

@@ -8,6 +8,7 @@ import 'dart:io';
 import 'dart:math' as math;
 
 import 'package:path/path.dart' as path;
+import 'package:retry/retry.dart';
 
 import 'utils.dart';
 
@@ -193,6 +194,20 @@ abstract class Device {
   /// Stop a process.
   Future<void> stop(String packageName);
 
+  /// Wait for the device to become ready.
+  Future<void> awaitDevice();
+
+  Future<void> uninstallApp() async {
+    await flutter('install', options: <String>[
+      '--uninstall-only',
+      '-d',
+      deviceId]);
+
+    await Future<void>.delayed(const Duration(seconds: 2));
+
+    await awaitDevice();
+  }
+
   @override
   String toString() {
     return 'device: $deviceId';
@@ -848,6 +863,23 @@ class AndroidDevice extends Device {
   Future<void> reboot() {
     return adb(<String>['reboot']);
   }
+
+  @override
+  Future<void> awaitDevice() async {
+    print('Waiting for device.');
+    final String waitOut = await adb(<String>['wait-for-device']);
+    print(waitOut);
+    const RetryOptions retryOptions = RetryOptions(delayFactor: Duration(seconds: 1), maxAttempts: 10, maxDelay: Duration(minutes: 1));
+    await retryOptions.retry(() async {
+      final String adbShellOut = await adb(<String>['shell', 'getprop sys.boot_completed']);
+      if (adbShellOut != '1') {
+        print('Device not ready.');
+        print(adbShellOut);
+        throw const DeviceException('Phone not ready.');
+      }
+    }, retryIf: (Exception e) => e is DeviceException);
+    print('Done waiting for device.');
+  }
 }
 
 class IosDeviceDiscovery implements DeviceDiscovery {
@@ -1081,6 +1113,9 @@ class IosDevice extends Device {
   Future<void> reboot() {
     return Process.run('idevicediagnostics', <String>['restart', '-u', deviceId]);
   }
+
+  @override
+  Future<void> awaitDevice() async {}
 }
 
 class LinuxDevice extends Device {
@@ -1133,6 +1168,9 @@ class LinuxDevice extends Device {
 
   @override
   Future<void> wakeUp() async { }
+
+  @override
+  Future<void> awaitDevice() async {}
 }
 
 class MacosDevice extends Device {
@@ -1185,6 +1223,9 @@ class MacosDevice extends Device {
 
   @override
   Future<void> wakeUp() async { }
+
+  @override
+  Future<void> awaitDevice() async {}
 }
 
 class WindowsDevice extends Device {
@@ -1237,6 +1278,9 @@ class WindowsDevice extends Device {
 
   @override
   Future<void> wakeUp() async { }
+
+  @override
+  Future<void> awaitDevice() async {}
 }
 
 /// Fuchsia device.
@@ -1291,6 +1335,9 @@ class FuchsiaDevice extends Device {
   Future<void> reboot() async {
     // Unsupported.
   }
+
+  @override
+  Future<void> awaitDevice() async {}
 }
 
 /// Path to the `adb` executable.
@@ -1366,6 +1413,9 @@ class FakeDevice extends Device {
   Future<void> reboot() async {
     // Unsupported.
   }
+
+  @override
+  Future<void> awaitDevice() async {}
 }
 
 class FakeDeviceDiscovery implements DeviceDiscovery {
@@ -1428,6 +1478,5 @@ class FakeDeviceDiscovery implements DeviceDiscovery {
   }
 
   @override
-  Future<void> performPreflightTasks() async {
-  }
+  Future<void> performPreflightTasks() async { }
 }

dev/devicelab/lib/tasks/perf_tests.dart

@@ -958,11 +958,7 @@ class StartupTest {
           }
         }
 
-        await flutter('install', options: <String>[
-          '--uninstall-only',
-          '-d',
-          device.deviceId,
-        ]);
+        await device.uninstallApp();
       }
 
       final Map<String, dynamic> averageResults = _average(results, iterations);
@@ -1084,11 +1080,7 @@ class DevtoolsStartupTest {
         await process.exitCode;
       }
 
-      await flutter('install', options: <String>[
-        '--uninstall-only',
-        '-d',
-        device.deviceId,
-      ]);
+      await device.uninstallApp();
 
       if (sawLine) {
         return TaskResult.success(null, benchmarkScoreKeys: <String>[]);
@@ -1850,7 +1842,7 @@ class MemoryTest {
       }
 
       await adb.cancel();
-      await flutter('install', options: <String>['--uninstall-only', '-d', device!.deviceId]);
+      await device!.uninstallApp();
 
       final ListStatistics startMemoryStatistics = ListStatistics(_startMemory);
       final ListStatistics endMemoryStatistics = ListStatistics(_endMemory);