Filter EGL attributes before passing them to the native driver. Adding extensions that are not native driver extensions would cause surface creation to fail. BUG=angleproject:1635 Change-Id: I2f683ee0560e463aa06f3ba92d0bf3f3d8c8927d Reviewed-on: https://chromium-review.googlesource.com/701602 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>