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This CL fixes the placeholder animation which was not correctly
supporting multiple details. Now, all details with placeholders
subscribe to the placeholder animation, which is stopped each time we
change the details.

This CL also fixes the wrong type of ShowDetailsProto.delay_ms, which
should be an int32 and not a bool.

Bug: b/174652960
Change-Id: Ib37479337bfc732d57c2b60ff168c28444e2575f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625885
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Auto-Submit: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#843439}