Add new complexclip3 gm.

This GM is used to test the combined clipping of a complex clip (packman shape)
and a simple one (circle). We loop over all combinations of clip ops, aa/bw clip,
and inverse/non-inverse clips.

This GM triggers a current bug in the gpu clipping code which fires an assert. Thus
the skipGPU flag is set until that bug is fixed.

BUG=skia:

Review URL: https://codereview.chromium.org/798793003
2 files changed