GitLab

This CL adds two accelerators into the profile creation flow to improve
accessibility and usability:
 - the back action for screens that actually show the back button
 - the reload action for the sign-in flow that happens over the internet
   and thus loading of the page can fail.

Bug: 1126913, 1167675
Change-Id: I3c197dea2859c0136db62249064249e0569a93da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627403
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844695}