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This CL passes the status of sliding on OnSlideChanged handler so that
the handler in ArcNotificationContentView can hide the copied surface
at the timing of the sliding finished.

Bug: 897653
Test: manual
Change-Id: I8e76d54f59105b6101b1d2dfc10eb171272be611
Reviewed-on: https://chromium-review.googlesource.com/c/1295632
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603003}