[flutter_engine] Run web_engine_analysis step.

This is so that analysis issues in web_ui code are caught and
identified.

Change-Id: Ib3a147eab8adc8f1d83b5efb07b8a551ba4cf181
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/169788
Commit-Queue: Alexander Aprelev <aam@google.com>
Reviewed-by: William Hesse <whesse@google.com>
5 files changed