Show reload button only when the slider is at the end.

Show reload button only when the slider is at the end.

After finishing playing video, the media_.ended keep true even after a user drag the slider.
This CL check the slider UI whether or not the position is at the end, and show reload button only when it is at the end.

BUG=413000
TEST=check the button after drag the slider for local video and ChromeCast.

Committed: https://crrev.com/61297e59a11e4970f2ba429a3c055d0ee0aebb9a
Cr-Commit-Position: refs/heads/master@{#301334}

[fukino, 2014-10-27 07:25:01]

fukino@chromium.org changed reviewers:
+ yoshiki@chromium.org

[fukino, 2014-10-27 07:25:01]

yoshiki@, PTAL the CL? Thanks!

[yoshiki, 2014-10-27 08:44:41]

lgtm

[fukino, 2014-10-27 09:22:55]

The CQ bit was checked by fukino@chromium.org

[commit-bot: I haz the power, 2014-10-27 09:23:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/667513003/1

[commit-bot: I haz the power, 2014-10-27 10:07:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-27 10:08:46]

Patchset 1 (id:??) landed as
https://crrev.com/61297e59a11e4970f2ba429a3c055d0ee0aebb9a
Cr-Commit-Position: refs/heads/master@{#301334}