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Paper-progress in 'indeterminate' state will recalculate its style on every
frame, which leads to high CPU load even when ths screen with this element
is hidden.

This CL ensures this attribute is set only before object is shown, and
paper-progress is marked hidden when it is no longer visible.

Bug: 866117
Change-Id: Ia64171b3e10df2bc564f03f9c3c007a2971cee26
Reviewed-on: https://chromium-review.googlesource.com/1188500Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586437}