Fix an issue when media controls never hide after certain tap sequence

Fix an issue when media controls never hide after certain tap sequence

This CL fixes an issue on media controls where after certain tap
sequences, the controls never hide because the control panel is hovered
(which should not happen). The fix is to ignore the hovering state if
the panel is tapped.

BUG=701746

[Zhiqiang Zhang (Slow), 2017-03-24 14:03:15]

zqzhang@chromium.org changed reviewers:
+ mlamouri@chromium.org

[Zhiqiang Zhang (Slow), 2017-03-24 14:03:28]

The CQ bit was checked by zqzhang@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-24 14:03:58]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-24 15:27:34]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-24 15:27:35]

Dry run: This issue passed the CQ dry run.

[mlamouri (slow - plz ping), 2017-03-30 13:29:15]

sgtm but can you add a test for this?

[Zhiqiang Zhang (Slow), 2017-03-30 16:23:30]

On 2017/03/30 at 13:29:15, mlamouri wrote:
> sgtm but can you add a test for this?

Just realized that we are actually breaking a case where both mouse and touch
screen exists.
When the mouse hovers on the video and the user taps the video, we will start
the timer to hide the controls.
We can add a test case for this, but I got another question on whether should be
proceed with this fix?
Ideally, this should be fixed by the input-dev team, but this CL at least fixes
a common annoying bug on Android which has larger population.

WDYT?

[mlamouri (slow - plz ping), 2017-03-30 20:47:12]

As discussed offline, I think we show the controls quite aggressively and hiding
them more shouldn't be a problem :)