Lockscreen Blur (1/2)

Revert "Revert "Lockscreen Blur""

We want to keep this.
This reverts commit dc82b58247e4946acd8ae497a65fd79b0b61ebb9.

Change-Id: I125d911e9e868e2b568876882b252e3375d66e78

Revert "Revert: Lockscreen blur": fix derp

Change-Id: I1dde45b623d8ed13168e68c666d3e0c7fef293ce

Lockscreen Blur: fix old nav/status bar shining through on lockscreen

Fix lockscreen blur on xxhdpi devices (thanks @Curtis Mayers)

All credits to Curtis Mayers: https://gerrit.paranoidandroid.co/#/c/382/

Fix lockscreen blur not working on flo

Fix: Correct possible null pointer when enabling see through lockscreen

PS2: Remove unused variable

Change-Id: I28884cb18964b273539261b8c0f72cedf2e60666

Fix coverflow problem caused by lockscreen blur

KeyguardViewManager: use cached see through setting

When merging PA remote repo, please keep in mind not to use "isSeeThroughEnabled()" but "mSeeThrough".

Merge PA's lockscreen blur without loosing our configurability

Change-Id: Id400b797804bea0fd63bb4fe6135f0966e813a05

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
	services/java/com/android/server/power/DisplayPowerController.java