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--use-vulkan flag is used, chrome will follow it, otherwise chrome will
use the new added Vulkan feature.

Bug: 1002487
Change-Id: I4d8d3674e0aa9831046810ec67edba21a9efd25a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795486Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Auto-Submit: Peng Huang <penghuang@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696670}