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The 'additional info' column can contain arbitrarily large contents. To make
viewing easier, this CL adds a download link to the cell on hover. Downloads
as JSON.

Change-Id: I004e050da09043fe9692e6a4b4e153645b2dc281
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1685896
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676637}