Merge changes from topic 'shadowweather' into ub-launcher3-master

* changes:
  Adding ability to set a custom blur mask filter and alphas in shadow generator. am: 665971c0 am: fdf394e2
  Adding ability to set a custom blur mask filter and alphas in shadow generator. am: 665971c0
  Adding ability to set a custom blur mask filter and alphas in shadow generator.