+++ This bug was initially created as a clone of Bug #905696 +++ When implementing constraints for bug 882145, we'll need the UI to support being told that a specific device should be the default one shown to the user. No string or other changes should occur; it's solely changing the default from the first device to a specified one. API TBD in bug 882145. This bug is for Android; it's especially useful on mobile devices for an app to specify 'front' or 'back' cameras as the default depending on the app in question.

So, basically, with the patches in bug 882145, the work needed here is: 1. Get the MediaStreamConstraintsInternal object from GetUserMediaRequest and pass it to GetUserMediaDevices(). 2. During device enumeration, fill in the facingMode property for Android cams. Should be a simple mapping of front to "user" and back to "environment". The list returned will be in priority order, so make sure the default is the first item.