egl: Fix device fallback if native display eglInitialize fails Mesa's EGL implementation may return an EGLDisplay that fails to initialize (e.g. an X11-backed EGLDisplay for `EGL_DEFAULT_DISPLAY` that fails to eglInitialize if the X server is inaccessible). Handle this case properly to ensure that ANGLE will properly fall back to using EGL devices. Bug: angleproject:8331 Change-Id: I629e95fc22f5618d10be082a3897857bcc79f890 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4749335 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>