Resource timing buffer

http://www.w3c-test.org/webperf/specs/ResourceTiming/

Re. this comment:
onresourcetimingbufferfull attribute
....*While executing the onresourcetimingbufferfull callback,
PerformanceResourceTiming will continue to be collected beyond the maximum
limit of the resources allowed*....

I tried to look up why we added it and couldn't find anything. Currently
this logic is not implemented by IE and Chrome.

Should we remove this? i.e. once the limit is reached, don't store new
resource timing objects irrespective of whether you are executing this
callback or not.

Arvind