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This CL adds implementation to create a network context through Network
Service for the Mirroring Service.

Bug: 734672
Change-Id: I26422b4f4f5c69bd8398dc3ae3d5ee501c996eea
Reviewed-on: https://chromium-review.googlesource.com/1139218Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577635}