Common code calculates strike for mask case.

Instead of the Renderer and the GPU calculating the strike,
the common code now calculates the strike.

Bug: skia:7515

Change-Id: I4bc65f83347e57f5b242380b0cadb74c43b8a152
Reviewed-on: https://skia-review.googlesource.com/c/191382
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed