override drawOval and drawRRect in GatherPixelRefDevice, so we don't miss those,
and possibly crash trying to raster into an empty device.

http://code.google.com/p/skia/issues/detail?id=1086
Review URL: https://codereview.appspot.com/7193057

git-svn-id: http://skia.googlecode.com/svn/trunk@7372 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed