Update: It's not clear whether we should take this approach or change this check to be made at the GeolocationServiceImpl level, in which case it could stay a C++ call.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0be22baf2251b72e634497f7208842db88337c9a

commit 0be22baf2251b72e634497f7208842db88337c9a
Author: Ke He <ke.he@intel.com>
Date: Mon Dec 18 05:12:38 2017

Change calls to GeolocationProvider::UserDidOptIntoLocationServices() to occur via Mojo.

Add the GeolocationControl mojo interface via which the chrome can inform
the geolocation-core that user opted in to location tracking.

Note that both the GeolocationServiceImpl from content and the
GeolocationPermissionContext from chrome have their own mojo connections to
Device Service. However, races are not an issue, as the Geolocation
implementation is already equipped to handle the case where requests for
geolocation come in prior to permission being granted by queuing those requests
and then unblocking them on granting of permission.

BUG= 725044 

Change-Id: I7e53f9cfd5698d09e4860ed7c869bcbd6991857a
Reviewed-on: https://chromium-review.googlesource.com/760239
Commit-Queue: Ke He <ke.he@intel.com>
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524652}
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/chrome/browser/DEPS
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/chrome/browser/chrome_content_browser_manifest_overlay.json
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/chrome/browser/geolocation/geolocation_permission_context.cc
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/chrome/browser/geolocation/geolocation_permission_context.h
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/device/geolocation/geolocation_provider.h
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/device/geolocation/geolocation_provider_impl.cc
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/device/geolocation/geolocation_provider_impl.h
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/device/geolocation/public/interfaces/BUILD.gn
[add] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/device/geolocation/public/interfaces/geolocation_control.mojom
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/services/device/device_service.cc
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/services/device/device_service.h
[modify] https://crrev.com/0be22baf2251b72e634497f7208842db88337c9a/services/device/manifest.json