GitLab

Introduce a move-only ScopedWlArray to make sure all wl_arrays in the tests
get wl_array_release()d when they are no longer needed.

Also rename SetWlArrayWithState() to AddStateToWlArray() since it appends
to its argument and doesn't replace the contents (this part has no behavior
change).

TBR=kbr

Bug: 855588
Change-Id: I384ca182b44c9cb864d2d3e94c8ed4f0a0a16f77
Reviewed-on: https://chromium-review.googlesource.com/1113658
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570160}