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This moves test-only paint op comparisons from unittests into paint ops
themselves.

This is to support a fuzzing correctness test that serializing and then
deserializing an op results in the same op.

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I351b4fb5329ee9ff64d54bb9dd49d0a1a34f7b13
Reviewed-on: https://chromium-review.googlesource.com/777840Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517675}