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GVR's built-in elbow model for the 3DoF controller requires a head pose to
calculate an estimated torso rotation and the elbow angles derived from that.
Passing this through needed some restructuring of the SendVSync logic to handle
asynchronous updates while avoiding duplicate pose calculations.

This also fixes the stuck-in-place controller on Lenovo Mirage, a 6DoF headset
with a 3DoF controller.

Bug: 968193
Change-Id: I14e95299a1e8134b1755a6ca14459b710f598c1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636830Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664646}