Filtering MutationObserver polyfill  messages from test_controller logging
Filtering MutationObserver polyfill  messages from test_controller logging

Basically the MutationObserver polyfill is using postMessage as a scheduling mechanism when MutationObserver is not supported (IE9,IE10). These messages are getting picked up by the test controller's logging, which is then putting them into the body. This in turn generates new mutation events, generating new messages. Endless loop.

This just filters messages which are random numbers.

BUG=
R=jmesserly@google.com

Review URL: https://codereview.chromium.org//34363005

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@29107 260f80e4-7a28-3924-810f-c04153c831b5

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