Fix verified input integration test without breaking the rest of the devicelab tests (attempt 5) (flutter#178093)

Reland of flutter#178018

On top of the above:
Only gets the adb path if it is an android test, and also try catches to
be doubly safe.

Note that the above PR did work for the android case, so as long as we
don't break the non-android case the test will be running now:
https://ci.chromium.org/ui/p/flutter/builders/staging/Linux_pixel_7pro%20android_verified_input_test/228/overview

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---------

Co-authored-by: Gray Mackall <mackall@google.com>

Author: 2 people

dev/devicelab/lib/tasks/integration_tests.dart

@@ -4,7 +4,7 @@
 
 import '../framework/devices.dart';
 import '../framework/framework.dart';
-import '../framework/talkback.dart';
+import '../framework/talkback.dart' hide adbPath;
 import '../framework/task_result.dart';
 import '../framework/utils.dart';
 
@@ -265,20 +265,38 @@ class DriverTest {
   Future<TaskResult> call() {
     return inDirectory<TaskResult>(testDirectory, () async {
       String deviceId;
+      Device? selectedDevice;
       if (deviceIdOverride != null) {
         deviceId = deviceIdOverride!;
       } else {
-        final Device device = await devices.workingDevice;
-        await device.unlock();
-        deviceId = device.deviceId;
+        selectedDevice = await devices.workingDevice;
+        await selectedDevice.unlock();
+        deviceId = selectedDevice.deviceId;
       }
       await flutter('packages', options: <String>['get']);
 
+      final bool isAndroidRun = selectedDevice != null
+          ? selectedDevice is AndroidDevice
+          : const <DeviceOperatingSystem>{
+              DeviceOperatingSystem.android,
+              DeviceOperatingSystem.androidArm,
+              DeviceOperatingSystem.androidArm64,
+            }.contains(deviceOperatingSystem);
+
+      String? devicelabAdbPath;
+      if (isAndroidRun) {
+        try {
+          devicelabAdbPath = adbPath;
+        } on DeviceException {
+          devicelabAdbPath = null;
+        }
+      }
       // Make the device ID available in the driver code, so tools like ADB can
       // reference it if needed.
       final Map<String, String> env = <String, String>{
         if (environment != null) ...environment!,
-        'DEVICE_ID_NUMBER': deviceId,
+        'FLUTTER_DEVICE_ID_NUMBER': deviceId,
+        if (devicelabAdbPath != null) 'FLUTTER_ADB_PATH': devicelabAdbPath,
       };
 
       final List<String> options = <String>[

dev/integration_tests/android_verified_input/test_driver/main_test.dart

@@ -28,7 +28,8 @@ Future<void> main() async {
     final Future<String> inputEventWasVerified = driver.requestData('input_was_verified');
 
     // Passed in by the driver task.
-    final String? deviceId = Platform.environment['DEVICE_ID_NUMBER'];
+    final String? deviceId = Platform.environment['FLUTTER_DEVICE_ID_NUMBER'];
+    final String? adbPath = Platform.environment['FLUTTER_ADB_PATH'];
 
     // Keep issuing taps until we get the requested data. The actual setup
     // of the platform view is asynchronous so we might have to tap more than
@@ -37,7 +38,7 @@ Future<void> main() async {
     inputEventWasVerified.whenComplete(() => stop = true);
     while (!stop) {
       // We must use the Android input tool to get verified input events.
-      final ProcessResult result = await Process.run('adb', <String>[
+      final ProcessResult result = await Process.run(adbPath ?? 'adb', <String>[
         if (deviceId != null) ...<String>['-s', deviceId],
         'shell',
         'input',