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The transform-post-multiplication testis very sensitive to changes in 2D matrix interpolation. This patch addresses the following:

* Use a prefix that guarantees that matrix and pairwise interpolation product different transforms.
  Previously relying on subtle numerical precision discrepancies.
  With the new prefix, pairwise will scale and transform will rotate.
* Fix matrix comparison to consider the full floating point value and not just the mantissa.
  Previously small non-zero values would be perceived as a matrix mismatch.

Bug: 797472

Change-Id: I9120f2f92195cf2559ff2eb4294e1341195c277e
Reviewed-on: https://chromium-review.googlesource.com/c/1337639Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608417}