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URLRequest job tracks the running total of raw network bytes that have
been read for each request. This is useful when determining the total
number of bytes that are still inflight.

Refactor related APIs to export this information to NQE.

Change-Id: I1209ca81429a22aa216c726c4381392d7f2e0e33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1688356Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Jianfeng Wang <jfwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678055}