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This doesn't really matter, but for consistency we should set this, so
that writing out the PaintShader yields the same PaintShader when
reading it back.  This fixes a fuzzer bug.

Bug: 883217
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I25488ce92fa8259c4be9974d0fdf4422e65b60ac
Reviewed-on: https://chromium-review.googlesource.com/1239544
Commit-Queue: enne <enne@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593410}