[2/2] framework/base: Add EdgeGesture service.

Based on code of PieService.

Change-Id: I053737e36340a5ec6814b21eb87575f9689c7e88

Conflicts:
	core/res/res/values/symbols.xml
	services/java/com/android/server/SystemServer.java
PhoneWindowManager: add ability to use EdgeGestureService for system gestures.

Update: Default to enabled

Conflicts:
	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Change-Id: Id4e2c0d82f771cd1c20e9196fb6db347494cca69

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
input: Forward-port support for chained input filters

 * Original code by Jens Doll for Pie controls
 * Needed now to support the gesture sensor

Change-Id: I0b86d70f9a040ba5953e1820e9818df0f10091ee