Try golden-testing on a Mokey (bringup: true), retry on an emulator (#163029)

Towards https://github.com/flutter/flutter/issues/162362 (see if retries
help VD on an emulator).
Towards https://github.com/flutter/flutter/issues/163025 (see if we can
golden-test on a device).

May the odds be in our favor.

dev/tools/android_driver_extensions/lib/src/backend/android/driver.dart

@@ -77,6 +77,12 @@ final class AndroidNativeDriver implements NativeDriver {
     return result['version']! as int;
   }
 
+  @override
+  Future<bool> get isEmulator async {
+    final Map<String, Object?> result = await _driver.sendCommand(NativeCommand.getIsEmulator);
+    return result['emulator']! as bool;
+  }
+
   /// Waits for 2 seconds before completing.
   ///
   /// There is no perfect way, outside of polling, to know when the device is

dev/tools/android_driver_extensions/lib/src/common.dart

@@ -30,6 +30,9 @@ final class NativeCommand extends Command {
   /// Gets the SDK version code.
   static const NativeCommand getSdkVersion = NativeCommand('sdk_version');
 
+  /// Gets whether the device is an emulator.
+  static const NativeCommand getIsEmulator = NativeCommand('is_emulator');
+
   /// The method to call on the plugin.
   final String method;
 

dev/tools/android_driver_extensions/lib/src/driver.dart

@@ -45,9 +45,12 @@ abstract interface class NativeDriver {
   /// ```
   Future<Duration> ping();
 
-  /// Returns the SDK version.
+  /// The SDK version.
   Future<int> get sdkVersion;
 
+  /// Whether the device is an emulator.
+  Future<bool> get isEmulator;
+
   /// Take a screenshot using a platform-specific mechanism.
   ///
   /// The image is returned as an opaque handle that can be used to retrieve