Content hub opens in a second layer if share video when it plays full screen

[freya zhang]

Information:
current build number: 371
device name: krillin
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2016-06-29 05:04:34
version version: 371
version ubuntu: 20160629
version device: 20160606-ab415b2
version custom: 2

Precondition:
Copy some video to the device.

Steps:
1.Go to the Videos scope and tap on 'My Videos'.
2.Select a video from the scope to detail page
3.Click on the thumbnail of the video to play it inside of the page
4.Tap on "maximize" button to play it full screen
5.Tap on "share" button on bottom left corner.
6.Check the result

Actual result:
Content hub opens in a second layer under video playing layer.

Expected result:
Content hub opens in the top layer.

Notes:
The issue is not reproduced when the video is minimized.