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Add the getParameters() function forwarding all the values
that are implemented in WebRTC to the Javascript layer.
Other properties that exist will be loaded for future use,
but not passed to the Javascript layer.
Currently behind RuntimeEnabled=RTCRtpSenderParameters.

Bug: 803494
Change-Id: Icd1c1ea58fd1ad3d50a46e97db3026837381c7b6
Reviewed-on: https://chromium-review.googlesource.com/919082Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Florent Castelli <orphis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542086}