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Only parameters encodings.active, encodings.maxBitrate and
encodings.priority are effectively working and connected
to the native layer.

Due to discrepancies between the WebRTC specification and the
native layers, the objects are not passed back from Javascript
and converted to native directly, but instead the relevant fields
are converted and patch the last result from getParameters().
If any read-only field is implemented by the native layer but not
exposed yet to Javascript, they will be left as is and won't cause
any InvalidModificationError.

Bug: 803494
Change-Id: Ia59734e5c3eddb54e5a1448a04fdcefe5a41a279
Reviewed-on: https://chromium-review.googlesource.com/969124Reviewed-by: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Florent Castelli <orphis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551477}