tree a4ebeafa01bb4ee7478f99400d9aad9e76d48276
parent c132c8c8766add55713aef2beeaacff000edb069
author Craig Stout <cstout@google.com> 1488610700 -0800
committer Craig Stout <cstout@google.com> 1489107718 -0800

Use semaphores for page flip.

Change-Id: I95804221fa8b638246cf4792370da76f70d2ac56