Make the listner list for bitmas and paths use a simple atomic
stack. This stack implementation does not have the ABA problem
because you can only pop the entire stack at once
with exchange(nullptr).
BUG=skia:8324
Change-Id: I7b0438a42c473b36cd4b0cbf236bf1692c5afab3
Reviewed-on: https://skia-review.googlesource.com/154861
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
6c8d242b14