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Previously TransformOperations::Blend would silently fail if either of the
input matrices was non-decomposible, returning an empty TransformOperations
list. This would end up being converted to the identity matrix for animations
purposes, which would result in incorrect animations on the compositor.

This CL fixes the logic to treat the non-decomposible cases as discrete
animations; that is, if the progress is <= 0.5 we return the 'from' input,
else we return the 'to' input.

Bug: 821351
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I82d3400ac183798cc71a1871c1f08e792e653c7a
Reviewed-on: https://chromium-review.googlesource.com/966599
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544117}