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Adds flags to the data.ndjson file, and exposed the information in the
UI using custom highlighting options. The UI will additionally list the
flags in the symbol infocard.

Bug: 847599
Change-Id: If2c7b7f5147296cf13e0c0ef9c36d6748820e42f
Reviewed-on: https://chromium-review.googlesource.com/1148795
Commit-Queue: Tiger Oakes <tigero@google.com>
Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577923}