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If an op contians a paint op buffer of size 2, then this code will fail.
All ops are at least size 4, so safely early out when this is not true.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ia44fa235f1e8fbae923b0ebf407bc6f0bc0a4cbe
Reviewed-on: https://chromium-review.googlesource.com/1205533Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588915}