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Also, making sure the source of motion events is set, in order
to avoid warnings from InputEventConsistencyVerifier.

BUG=848740

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: Id1ee62b2d9eb63a6a3058b7a0914914823cf81d9
Reviewed-on: https://chromium-review.googlesource.com/1089856
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565437}