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This boolean is to indicate whether host resolution has been completed and we use that to notify QuicStreamRequest(s) to expect host resolution. No behavior change, this change prepares QSF::Job to race QUIC connection and host resolution which could be in different state before host resolution completes.

Change-Id: I3fdd3cc6b13ecd5ed1f9d9e0cdaa40a833d3bd94
Reviewed-on: https://chromium-review.googlesource.com/1211977Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589756}