[Webkit-unassigned] [Bug 137407] window.performance object resets script-applied properties

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=137407

krinklemail at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |krinklemail at gmail.com

--- Comment #3 from krinklemail at gmail.com ---
Downstream report from Wikimedia where this caused fatal
exceptions for Safari users reading Wikipedia:
https://phabricator.wikimedia.org/T112287#1638614

Test case:
http://codepen.io/Krinkle/debug/YywQJb

It has three checkpoints:
1) Immediately after definition.
2) From a <script src> loaded script.
3) After window.onload.

In Safari 8.0.8, sometimes 'performance.mark' is defined at all thee, sometimes only at #1, sometimes at #1 and #2.

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