Add support for Android x86_64 ABI to Flutter (#42401)

packages/flutter_tools/test/general.shard/android/gradle_test.dart

diff --git a/packages/flutter_tools/test/general.shard/android/gradle_test.dart b/packages/flutter_tools/test/general.shard/android/gradle_test.dart
index 5c6434d..ccc9a21 100644
--- a/packages/flutter_tools/test/general.shard/android/gradle_test.dart
+++ b/packages/flutter_tools/test/general.shard/android/gradle_test.dart
@@ -1267,7 +1267,7 @@
           '-Pflutter-root=$flutterRoot',
           '-Poutput-dir=${buildDirectory.path}',
           '-Pis-plugin=true',
-          '-Ptarget-platform=android-arm,android-arm64',
+          '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleAarRelease',
         ],
         environment: anyNamed('environment'),
@@ -1281,7 +1281,7 @@
           '-Pflutter-root=$flutterRoot',
           '-Poutput-dir=${buildDirectory.path}',
           '-Pis-plugin=true',
-          '-Ptarget-platform=android-arm,android-arm64',
+          '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleAarRelease',
         ],
         environment: anyNamed('environment'),