Add tests for printer setup dialog state.

Bug: 
Change-Id: I9649650f8e38d181d5bfe7045b7036bd094a236f
Reviewed-on: https://chromium-review.googlesource.com/562657
Commit-Queue: Sean Kau <skau@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487271}
2 files changed