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This CL fixes potential inconsistency between backend format we used
to create promise image and one in fallback image in case we'll need
one. This causes internal checks in Skia to fail.

Bug: 998876
Change-Id: I5d7e25472c392c42b5b9f766ca525e965d0f4a4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1776206
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691739}