GitLab

This patch adds a new tab to the net-internals page, which shows the
current contents of the Reporting cache.  This includes a section on any
queued reports, and a section showing any origins that we've received
Reporting headers from.

Bug: 829353
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I496d360fb1cf0f5e6c626e72415d8a624a25151b
Reviewed-on: https://chromium-review.googlesource.com/998752
Commit-Queue: Douglas Creager <dcreager@google.com>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550771}