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This CL adds indicator to the location bar to inform the user
that the web page is using device sensors. Clicking the indicator
allows the user to change site specific settings or go to corresponding
global content settings menu.

UI can be enabled by flipping kGenericSensorExtraClasses feature flag.

Bug: 796904
Change-Id: Idac4c1fdd04041dae27982e5c5173edc65e0679c
Reviewed-on: https://chromium-review.googlesource.com/836887
Commit-Queue: Alexander Shalamov <alexander.shalamov@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Mikhail Pozdnyakov <mikhail.pozdnyakov@intel.com>
Cr-Commit-Position: refs/heads/master@{#563630}