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Throughout cc callers sometimes need to check if a transformation
matrix preserves axis alignment or is a perspective projection. These
functions already exist on SkMatrix, but we're trying to move away from
SkMatrix towards SkM44. Add the helper functions to cc itself with a
note to maybe add them to Skia if they start getting used outside of cc.

Bug: 1155544
Change-Id: Ieb90af59775b9ec22029e9e941acbb937179c978
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595831Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Aaron Krajeski <aaronhk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838754}