Fixes a destructive conflict between the 60Hz anti-fingerprinting
snapping logic (kThrottleMainFrameTo60Hz) and the native
kOnBeginFrameThrottleVideo feature when hardware VSync is disabled.
The artificial timestamp snapping introduced by the anti-fingerprinting
patch tricks the viz video throttling heuristics into thinking the
playback is unstable, forcing the compositor to drop BeginFrame
intervals to 30Hz (33.3ms). This leads to false lost frames and severe
stuttering in the media pipeline. Disabling kOnBeginFrameThrottleVideo
restores the continuous 60Hz rhythm.
Carmelo Messina
36e44acc71