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Implements two fixes that were causing testStartActivityTriggersDoff* to
fail 100% of the time.

1. Waits until the UI is quiescent after starting the activity, as
previously, clicks were being sent before the DOFF prompt was visible,
causing the test to time out.

2. Applies a small deadzone to the head offset used for repositioning
the VR controller on 6DOF devices. Even on 3DOF devices, the offset
drifted within a very tiny area, which cause the controller to be
perpetually dirty and prevent the UI from reaching quiescence.

Bug: 831589, 848074
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr
Change-Id: Ic912dd3aa92ac2102c34e4acc330447a3ce0ca8d
Reviewed-on: https://chromium-review.googlesource.com/1087723
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564970}