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When ARCore loses tracking, continue providing camera images, but send null
poses. This allows JS applications to handle tracking loss, i.e. by displaying
a pose-independent info message.

BUG: 837116
Change-Id: I92238f1bf158ca2714a4068ddba8ac5bbdb123fc
Reviewed-on: https://chromium-review.googlesource.com/1043207Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565051}