Add back navigation ring customization.

Change-Id: Iebe4ec7c2519b85cfd5189d060444764a50f3cf6

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/symbols.xml
	packages/SystemUI/src/com/android/systemui/SearchPanelView.java
Add GlowPadView extensions needed for lockscreen targets and nav ring.

Change-Id: I4f82fd3fe04ac16c6737d38b2473f2a533c5d326
Framework : Lockscreen - Customizable shortcuts

Forward port lockscreen shortcuts

Change-Id: Ic3b935df5c0da35f31373d96943e442dc39cf11b

Conflicts:
	packages/Keyguard/res/drawable-hdpi/ic_lockscreen_chrome_activated.png
	packages/Keyguard/res/drawable-hdpi/ic_lockscreen_chrome_normal.png
	packages/Keyguard/res/drawable-hdpi/ic_lockscreen_contacts_activated.png
	packages/Keyguard/res/drawable-hdpi/ic_lockscreen_contacts_normal.png
	packages/Keyguard/res/drawable-mdpi/ic_lockscreen_chrome_activated.png
	packages/Keyguard/res/drawable-mdpi/ic_lockscreen_chrome_normal.png
	packages/Keyguard/res/drawable-mdpi/ic_lockscreen_contacts_activated.png
	packages/Keyguard/res/drawable-mdpi/ic_lockscreen_contacts_normal.png
	packages/Keyguard/res/drawable-xhdpi/ic_lockscreen_chrome_activated.png
	packages/Keyguard/res/drawable-xhdpi/ic_lockscreen_chrome_normal.png
	packages/Keyguard/res/drawable-xhdpi/ic_lockscreen_contacts_activated.png
	packages/Keyguard/res/drawable-xhdpi/ic_lockscreen_contacts_normal.png
	packages/Keyguard/src/com/android/keyguard/KeyguardSelectorView.java
Framework: Fix some derps and define default targets for Lock screen targets

Change-Id: I2537d22387f88199d55c85980dbfc316db9217f7