Lockscreen blur and blur radius (1/2)

Change-Id: Iab92bc2adfc2c861cd4f1baccdba2409a5deb788

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
	policy/src/com/android/internal/policy/impl/keyguard/KeyguardServiceWrapper.java

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java

Lockscreen Blur: Disable if music is playing

Some apps don't employ full screen album art.
In that case album art doesn't override wallpaper & content behind screen is clearly visible.
This fixes that issue.

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