GitLab

[Cronet] Define CronetMetrics class implementing the iOS NSURLSessionTaskTransactionMetrics interface

This creates a class |CronetMetrics| which provides setters for all of the propeties defined in
NSURLSessionTaskTransactionMetrics.

Bug: 702796
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Icdcc917001c0ceb20107e2f128dba88259330f78
Reviewed-on: https://chromium-review.googlesource.com/744401
Commit-Queue: Lily Houghton <lilyhoughton@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515444}