Update headers to include EGL_EXT_image_flush_external

BUG=chromium:582660
TEST=emerge-daisy and verify updated headers.

Change-Id: Id89d763072d6baa3537f89b58f1472f539f817dc
Reviewed-on: https://chromium-review.googlesource.com/324143
Commit-Ready: Haixia Shi <hshi@chromium.org>
Tested-by: Haixia Shi <hshi@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
1 file changed