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This new image type can hook an X11 pixmap up to an egl pixmap surface,
which lets VaapiPictureNativePixmapAngle create xlib pixmaps and bind
them as surfaces.

With this cl, the flag --enable-accelerated-video-decode will be
functional on a modern intel graphics linux system while using ANGLE.

Bug: 1103510

Change-Id: I9c2bce16729be1e8f007b47da5a5160074f78483
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288633
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798952}