Re-land with a fix for an unitialized variable

Instead the refcount is done via callbacks. This allows Surface to
ignore this refcounting which will be useful in a follow-up CL.

BUG=angleproject:891

Change-Id: I1925ccaa4ce7b502b33088660d31c404b8313cb5
Reviewed-on: https://chromium-review.googlesource.com/293712Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>