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90  * Returns the timestamp of the next vsync in phase with last_timestamp_.
99  *  Thus, we must sleep until timestamp 687 to maintain phase with the last
100  *  timestamp.
112 int VSyncWorker::SyntheticWaitVBlank(int64_t *timestamp) {
134   *timestamp = (int64_t)vsync.tv_sec * kOneSecondNs + (int64_t)vsync.tv_nsec;
177   int64_t timestamp;
182     ret = SyntheticWaitVBlank(&timestamp);
186     timestamp = (int64_t)vblank.reply.tval_sec * kOneSecondNs +
200     procs->vsync(procs, display, timestamp);
201   last_timestamp_ = timestamp;