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To support the "Rewind" event generated by media controller devices
(e.g. a USB HID Keyboard or a Bluetooth headset). Add handling in
media_controller_impl. One "Rewind" key press will fire a Seek backward
with kDefaultSeekTime=5 seconds using the media session service.

BUG=1054411

Change-Id: I87669472cc0076a28df4a4752ad8af5a41983794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065849
Commit-Queue: Michael Sun <michaelfsun@google.com>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743364}