Lower the parserTimeLimit to 200ms instead of 500ms
Lower the parserTimeLimit to 200ms instead of 500ms

In our testing on a Nexus 7, nine of the top 25 sites
exceed 200ms in max parse time and pintrest appears to
be hitting the 500ms limit.

This change has the potential to make some benchmarks
(like the page cyclers) very slightly slower, as they
may be yielding more often during parsing.

This will definitely make some sites on mobile slightly less
janky, as any time they were exceeding 200ms in a parse block
the page would have been non-responsive to the user.

R=tonyg,abarth

Review URL: https://chromiumcodereview.appspot.com/18341005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@153384 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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