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Initialize Vulkan for both Skia Vulkan and for Skia Dawn on Linux.
Vulkan and Dawn both require OOP-R, so replace use_vulkan() with either
use_skia_vulkan() or use_oopr(), depending on context.

Bug: 1021566
Change-Id: I68c4f789252fa700bd78ec01a44e03df6f1fc0b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135006Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760510}