Re-enable imageresizetiled, but skip it in tilegrid and rtree.

This change makes kSkipTiled_Flag also skip --tileGrid and --rtree.
All GMs which were passing kSkipTiled_Flag before were also passing
kSkipPicture_Flag, which also skips tilegrid and rtree, so this should
have no effect on them, but provides a smaller hammer for GMs which
still want to test picture playback, but not tiling.

The exception is magnifier, which was passing only kSkipTiled_Flag,
but magnifier is an odd beast and not web-exposed, so I'm not worried
about reducing its coverage slightly.

R=scroggo@google.com
BUG=skia:

Review URL: https://codereview.chromium.org/165723009

git-svn-id: http://skia.googlecode.com/svn/trunk@13514 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed