Merge change 9520 into donut

* changes:
  Integrate unsubmitted cupcake change 131131: 	CTS: add test cases for graphics.LinearGradient, PaintFlagsDrawFilter, PathDashPathEffect, PixelXorXfermode and PorterDuffColorFilter
tree: 5e6022aef41da4c5ddb2b9072c75c2d30a923e30
  1. tests/
  2. tools/
  3. Android.mk