#181933 enables running engine dart tests with an opengles impeller backend. Some of the existing engine dart tests do not pass when running on opengles. They are filtered out in run_tests.py: https://github.com/flutter/flutter/pull/181933/changes#diff-208f1d19de16cc0af95bc6c1c374cde2f450d73098b217e66b3cf98f1b097b3cR939.

We should debug and re-enable these tests.

codec_test.dart
decode_image_from_pixels_sync_test.dart
encoding_test.dart
fragment_shader_test.dart
gpu_test.dart
high_bitrate_texture_test.dart
image_dispose_test.dart
image_resize_test.dart