am a8dfe24d: Adds the ability to configure the mock Geolocation service from DumpRenderTree.

Merge commit 'a8dfe24da014b52d7ae93c3fbd7a8b88ec336572'

* commit 'a8dfe24da014b52d7ae93c3fbd7a8b88ec336572':
  Adds the ability to configure the mock Geolocation service from DumpRenderTree.