Verify the time offset is going the right direction

[rpavlik]

SteamVR's docs aren't entirely clear to me as to which direction the time offset (found in some callbacks, but most notably tracker) should be applied.

See code links:

OSVR-Vive/OSVRViveTracker.cpp

Line 105 in 79977ed

/// Single, centralized routine to apply the various event time offsets - so

and for example, these callbacks (in the Pose one, it's actually inside the struct)

OSVR-Vive/OSVRViveTracker.cpp

Line 619 in 79977ed

void ViveDriverHost::TrackedDeviceButtonPressed(uint32_t unWhichDevice,

I picked a direction, but hard to know if I picked it right. The value for buttons seems to be always 0 in my testing, while the tracker value goes small but non-negligible values positive and negative, so no obviously answer there.