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This patch introduces mock implementations of the Sensor
and SensorProvider mojo interfaces to the WPT tests
for Chromium.

The ongoing WPT issue for the Generic Sensor tests automation:
https://github.com/w3c/web-platform-tests/issues/9686

Bug: 816462
Change-Id: I8e4880ee5269b07f0bf68a2752038e128d166c55
Reviewed-on: https://chromium-review.googlesource.com/980886Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Alexander Shalamov <alexander.shalamov@intel.com>
Commit-Queue: Mikhail Pozdnyakov <mikhail.pozdnyakov@intel.com>
Cr-Commit-Position: refs/heads/master@{#550586}