RC: Lockscreen Targets: Change how we instantiate the
unlock widget since the same id might have different
instances. GlowPadView/CirclesView.

Change-Id: I20453323019e79c22c8c3e68cd0c86a881e0e439
Remove duplicated onTargetChange from last commit to fix build.

 Patch Set 2: #blamebabyjesus

Change-Id: Ia11d1db88852be6f7a76843e7b0d70a87102130e
Add alpha settings to Circles lockscreen rings

Change-Id: I463a36a431c619ed13f3728ab6e0be2cf3a85db8