GrTessellator: eliminate some redundant computation.

No need to recompute the bisector when mitering.

Change-Id: If7b99244d530d4b2241b7b45611f9401b2f02d69
Reviewed-on: https://skia-review.googlesource.com/93673
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
1 file changed