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Now Vulkan and out-of-process rasterization is supported in WebEngine.
It's enabled only when it detects that the Vulkan loader service is
present in the service directory passed during Context creation. Also
removed Vulkan loader service from the CastRunner manifest, so for
now WebRunner is the only client that will have Vulkan enabled.

Bug: 962617
Change-Id: I5994b825057aebfc10ff5a828c7ace947aec3816
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618242
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669026}