GitLab

This change adds a boolean `was_cached` to the SubresourceLoadInfo
struct.  This lets consumers know whether or not the response was
fetched from the network cache.  Notably, this is important for
recording page load metrics when the Network Service is enabled.

BUG=816684

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I28d60ff7286feca5d333203405ee9c351f43c0ab
Reviewed-on: https://chromium-review.googlesource.com/938650Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Conley Owens <cco3@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543276}