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This CL extends the freeze timer function to allow the controls
freeze between sessions. This will avoid controls changing
from one session to another when the active session goes next track.
We will now always wait for a brief time to see if the previous session
resumes before we update our controls.

Bug: 1134458

Change-Id: I7b6d9d2ad1861b02c2399c6527b57cad685aba3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442195Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813286}