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outparam and compute the HTTP/2 weight in addition to the parent stream
ID, and exclusive bool so that callers do not need to.

Change-Id: I13ebd842f86b5aed9e517a0dc94612c8007af33f
Reviewed-on: https://chromium-review.googlesource.com/915108
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Randy Smith <rdsmith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537494}