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Alignment code was showing up in paint op serialization perf, so this
patch makes alignment explicit instead of implicit.  Callers that
know that their writes are already aligned aren't forced into extra
work.

DrawRectOp serialization is 6.2x faster and deserialization is 2.2x faster.

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I5678c0510c3200eff496c07a6fbb88e70054b27b
Reviewed-on: https://chromium-review.googlesource.com/798470
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520990}