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Currently, the initial media control shown is always the play
(untoggled) icon. This change checks for whether or not the play is
currently active, or playing, when entering Picture-in-Picture mode.

This change also updates how media player state (active / inactive) and
other relevant information (e.g. media player id) is retrieved. The
MediaWebContentsObserver and MediaPlayerId are not updated after
entering Picture-in-Picture mode.

BUG: 836389
Change-Id: I64baafebc20bf91fd457866237d1ec8dd526fd68
Reviewed-on: https://chromium-review.googlesource.com/1034158
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555952}