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On the login and lock screen, the easy unlock icon and the capslock enabled icon share the same space. This CL introduces an animation that switches from one to another when both should be displayed.
The one that just got enabled is immediately shown. After 2s, a transition is done to the other icon with a fade-out and fade-in effect of 0.5s each. This other icon is shown 2s and then we transition to the first one again. This cycle continues until one of the icon should not be shown.

Bug: 1003885
Change-Id: I37711de090ba757153e0bfa0e5081c9660a8a525
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587059Reviewed-by: Ian Vollick <vollick@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Thomas Tellier <tellier@google.com>
Cr-Commit-Position: refs/heads/master@{#840184}