De-duplicating violation reports?

While poking at a bug in Blink's support of 'eval()' in report-only
mode[1], Adam suggested rate-limiting the reporting to avoid a tight loop
sending a great number of violation reports. That is, given a report-only
policy that doesn't whitelist 'eval()', the following code will generate
the same JSON object 1,000 times.

    for (i=0; i<1000; i++)
        eval(...);

What do you folks think about going one step further than rate-limiting the
reporting by deduplicating the reports so that we send a unique JSON object
once and only once per page load? I could imagine changing the "send
violation reports" steps to compare the JSON object against a list of the
objects we've already sent, and abort if there's an exact match.

Is there value I'm missing in getting violation reports for each instance
of a violation?

[1]: https://codereview.chromium.org/19787002/

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Mike West <mkwst@google.com>, Developer Advocate
Google Germany GmbH, Dienerstrasse 12, 80331 München, Germany
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