Add add_and_true_to_loop_condition workaround

See https://bugs.chromium.org/p/chromium/issues/detail?id=644669#c4 for
what this is doing and trying to work around.

Bug: chromium: 644669, 829614
Change-Id: I5616eb6f7299c30e5bdf812e55099ac0a8fc9c1d
Reviewed-on: https://skia-review.googlesource.com/146856
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Adrienne Walker <enne@chromium.org>
8 files changed