Implement highQualityFilter16 so GM doesn't crash when you give it resources.

Testing consisted of:
 1) ninja -C out/Debug gm && gm -i resources --match mandrill_512 -w /tmp/gm
 2) notice that gm didn't segfault
 3) look in /tmp/gm and see a bunch of handsome monkeys

BUG=skia:1517
R=humper@google.com

Review URL: https://codereview.chromium.org/22801016

git-svn-id: http://skia.googlecode.com/svn/trunk@10917 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed