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Add helper functions to do the conversion and switch to gfx equivalents.

Bug: 10611824
Change-Id: Ie4633980d37ba97a92f46b8f465356a4334ac483
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2101984
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750251}