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This CL changes the logic for displaying controls in quick settings
such that we will only show controls if the title of the session is
not empty and the session is controllable. This also matches the logic
for showing notification in Chrome global media controls.

Bug: 1142625
Change-Id: I91d7f8279b8602d89af50bdf7c891b3440abd9ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523735
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825455}