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This JSON copy of the data will let us show the current contents of the
Reporting cache in the net-internals page.

Bug: 829353
Change-Id: I005f642e506d9c70e58c1b5799263931327c4a1f
Reviewed-on: https://chromium-review.googlesource.com/996883
Commit-Queue: Douglas Creager <dcreager@google.com>
Reviewed-by: Julia Tuttle <juliatuttle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550612}