fix day-range updating the displayed begin and end times.
fix day-range updating the displayed begin and end times.

BUG=skia:

Change-Id: Ia7f6a5dd642f254b1d973aedb83a59a351c4d5fe
Reviewed-on: https://skia-review.googlesource.com/4229
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot