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This adds a FileOperations implementation which can send the host's
RTC event log as if it were a regular file. It runs on the same network
thread that gathers the RTC event log and sends file-transfer data, so
on Windows it should work inside the network process without any need
for IPC.

Bug: 1122798
Change-Id: I6b4484caa70804e0091e7a747ebf9ff60fe71b14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441449
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Erik Jensen <rkjnsn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812839}