Open taskMenu based on TaskIdAttributeContainer

* We were always passing in the same task no matter
which task icon was clicked.
* Use TaskIdAttributeContainer to associate
IconViews with their respective tasks

Fixes: 206154715
Test: Correct menu opens for split and fullscreen
tasks

Change-Id: I5f264bb69828532bdefffb7ec4b9ff1e501de086
3 files changed