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

BUG=1054411

Change-Id: I50b9a08c07a48143c3bf8ab516374db7a7497c68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064749Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Michael Sun <michaelfsun@google.com>
Cr-Commit-Position: refs/heads/master@{#743359}