file system watcher fails to run on Android, claims file watching is unsupported

[aam]

/======================================================================================================\
| standalone_2/io/file_system_watcher_large_set_test/0 is new and failed (RuntimeError, expected Pass) |
\======================================================================================================/

--- Command "vm_compile_to_kernel" (took 01.000312s):
DART_CONFIGURATION=ReleaseAndroidARM_X64 /b/swarming/w/ir/pkg/vm/tool/gen_kernel --aot --platform=out/ReleaseAndroidARM_X64/vm_platform_strong.dill -o /b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.dill /b/swarming/w/ir/tests/standalone_2/io/file_system_watcher_large_set_test.dart --packages=/b/swarming/w/ir/.packages -Ddart.vm.product=false

exit code:
0

--- Command "precompiler" (took 01.000993s):
DART_CONFIGURATION=ReleaseAndroidARM_X64 out/ReleaseAndroidARM_X64/clang_x64/gen_snapshot --snapshot-kind=app-aot-elf --elf=/b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.aotsnapshot --loading-unit-manifest=/b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/ignored.json --delayed-filewatch-callback --enable-isolate-groups --experimental-enable-isolate-groups-jit --ignore-unrecognized-flags --packages=/b/swarming/w/ir/.packages /b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.dill

exit code:
0

--- Command "remove_kernel_file" (took 2ms):
DART_CONFIGURATION=ReleaseAndroidARM_X64 rm /b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.dill

exit code:
0

--- Command "strip" (took 20ms):
DART_CONFIGURATION=ReleaseAndroidARM_X64 third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-strip --strip-unneeded /b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.aotsnapshot

exit code:
0

--- Command "adb_precompilation" (took 01.000380s):
Steps to push precompiled runner and precompiled code to an attached device. Uses (and requires) adb.

exit code:
255

stdout:
Executing adb -s 06ada00c003b6f92 shell rm -Rf /data/local/tmp/precompilation-testing/test ; echo AdbShellExitCode:  $?
Stdout:
AdbShellExitCode: 0
ExitCode: 0
Time: 0:00:00.014691

Executing adb -s 06ada00c003b6f92 shell mkdir -p /data/local/tmp/precompilation-testing/test ; echo AdbShellExitCode:  $?
Stdout:
AdbShellExitCode: 0
ExitCode: 0
Time: 0:00:00.013411

Executing Skipped cached push
ExitCode: 0
Time: 0:00:00.000017

Executing Skipped cached push
ExitCode: 0
Time: 0:00:00.000002

Executing Skipped cached push
ExitCode: 0
Time: 0:00:00.000002

Executing adb -s 06ada00c003b6f92 shell chmod 777 /data/local/tmp/precompilation-testing/dart_precompiled_runtime /data/local/tmp/precompilation-testing/process_test /data/local/tmp/precompilation-testing/abstract_socket_test ; echo AdbShellExitCode:  $?
Stdout:
AdbShellExitCode: 0
ExitCode: 0
Time: 0:00:00.013336

Executing adb -s 06ada00c003b6f92 push /b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.aotsnapshot /data/local/tmp/precompilation-testing/test/out.aotsnapshot
Stdout:
/b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/out.aotsnapshot: 1 file pushed. 8.2 MB/s (1999456 bytes in 0.232s)
ExitCode: 0
Time: 0:00:00.237181

Executing adb -s 06ada00c003b6f92 push /b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/ignored.json /data/local/tmp/precompilation-testing/test/ignored.json
Stdout:
/b/swarming/w/ir/out/ReleaseAndroidARM_X64/generated_compilations/dartkp-android-release-arm_x64/tests_standalone_2_io_file_system_watcher_large_set_test/ignored.json: 1 file pushed. 0.9 MB/s (961 bytes in 0.001s)
ExitCode: 0
Time: 0:00:00.005454

Executing adb -s 06ada00c003b6f92 shell export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/data/local/tmp/precompilation-testing/test;/data/local/tmp/precompilation-testing/dart_precompiled_runtime --android-log-to-stderr --delayed-filewatch-callback --enable-isolate-groups --experimental-enable-isolate-groups-jit --ignore-unrecognized-flags --packages=/b/swarming/w/ir/.packages /data/local/tmp/precompilation-testing/test/out.aotsnapshot ; echo AdbShellExitCode:  $?
Stdout:
WARNING: linker: /data/local/tmp/precompilation-testing/dart_precompiled_runtime: unused DT entry: type 0x6ffffef5 arg 0x1405a8
WARNING: linker: /data/local/tmp/precompilation-testing/dart_precompiled_runtime: unused DT entry: type 0x6ffffffe arg 0x194fe4
WARNING: linker: /data/local/tmp/precompilation-testing/dart_precompiled_runtime: unused DT entry: type 0x6fffffff arg 0x3
Unhandled exception:
FileSystemException: File system watching is not supported on this platform, path = ''
#0      _FileSystemWatcher._watch (dart:io-patch/file_patch.dart:125)
#1      FileSystemEntity.watch (dart:io/file_system_entity.dart:447)
#2      main (file:///b/swarming/w/ir/tests/standalone_2/io/file_system_watcher_large_set_test.dart:29)
#3      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:283)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:184)
AdbShellExitCode: 255
ExitCode: 255
Time: 0:00:01.064588

--- Re-run this test:
python3 tools/test.py -n dartkp-android-release-arm_x64 standalone_2/io/file_system_watcher_large_set_test/0