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This CL adds the interface to get estimated network capacity from
Remoter. A follow up CL will check whether the network bandwidth is
sufficient to activate media remoting.

Bug: 739972
Change-Id: Ica6aee81b23894748951fc8f27afcf74dabb6a28
Reviewed-on: https://chromium-review.googlesource.com/587507
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491772}