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Add "pip-presented" CSS class to menu list and track list when picture in picture is enabled.
Remove the CSS class when pip is disabled.
So that we can have different menu width depending on whether we have pip button in menu.

Bug: 901738
Change-Id: I08c0c480fef221f19917637fc9538e66f99f79ca
Reviewed-on: https://chromium-review.googlesource.com/c/1357601Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612936}