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This flag shoulld already be enabled for virtual web tests, since
crrev.com/c/1798523

Additionally disable JPEG YUV decoding for non-yuv gpu rasterization
tests.

Bug: 1037798
Change-Id: I80c8ea7eb54478b54f14145f18fb1b90023db395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982628Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730221}