GitLab

This CL changes the implementation of the dice sign-in button in the
user menu. Instead of a HoverButton the newly implemented
DiceSigninButton is used.

Changes to DiceSigninButton:
 - The account icon is passed to the constructor.
 - An option to not show the drop down arrow is added.

Bug: 786369
Change-Id: Ideadb6674ebd356374883968eabfd53cba9e1167
Reviewed-on: https://chromium-review.googlesource.com/891319
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534051}