Includes a fix for creating pbuffers with <buftype> EGL_D3D_TEXTURE
with EGL_WIDTH and EGL_HEIGHT attributes.

BUG=angleproject:1649
TBR=geofflang@chromium.org

Change-Id: Id2974b8fab02c3218febfac708b9b034e65cbc53
Reviewed-on: https://chromium-review.googlesource.com/823248Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>