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Extract driver vendor from ANGLE's renderer description according to the
format implemented in OpenGL and Vulkan backend.

Bug: 994852
Change-Id: I0b72166b504f1a83762a12f1d574c8cd20bf9df3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903404Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Lin Sun <lin.sun@intel.com>
Cr-Commit-Position: refs/heads/master@{#715154}