WebGPU OpenGL: pass eglGetProcAddress & EGLDisplay.

If eglGetProcAddress is not passed to Dawn, it will attempt to
dlopen/LoadLibrary libEGL lib itself, and to infer the display
from the current or default EGLDisplay. This approach is fragile.

This change causes Chrome to pass the actual eglGetProcAddress and
EGLDisplay it is using to Dawn for initialization, in order to
ensure correctness.

Bug: dawn:810
Change-Id: Idaf674d750fb8d6a0db24a7f99e26e3d37782d1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4770974
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Stephen White <senorblanco@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1182190}