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

Based on code of PieService.

Conflicts:
	core/res/res/values/symbols.xml

Change-Id: I053737e36340a5ec6814b21eb87575f9689c7e88

Conflicts:
	core/res/res/values/symbols.xml