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The patch makes it possible to sanity check the interpolation paths for 2-D matrix transformations.

The decomposition of a 2-D or a 3-D matrix is not unique, and can therefore affect the interpolation path. For example, negative scaling and rotation can be interchanged in some combinations. By restricting the tests to transforms produced by a restricted set of 2-D geometric operations, we can highlight cases where there is a preferred decomposition, and more easily flag regressions.

Bug: 797472
Change-Id: Ic7d240ae6978e25aded183ea811c76a179f1e16a
Reviewed-on: https://chromium-review.googlesource.com/c/1340941Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609293}