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This CL adds the SessionMonitor that collects WiFi status reported by
receiver, extra tags, and Cast Streaming raw events/stats for an active
mirroring session. The data is assembled and re-packaged as requested
to be included in user feedback report uploads.

Bug: 734672
Change-Id: If3644cb345c3cbe8c1cfbd5474432667f426944a
Reviewed-on: https://chromium-review.googlesource.com/1055789Reviewed-by: Helen Li <xunjieli@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560662}