Add a performance tests for selecting all content in a document
https://bugs.webkit.org/show_bug.cgi?id=113358

Reviewed by Levi Weintraub.

Add a performance test for selecting all. We wait for paint to happen by setTimeout(~, 0).

Example outputs:
    RESULT Interactive: SelectAll: Time= 652.6 ms
    median= 644.5 ms, stdev= 54.6177144967 ms, min= 599.0 ms, max= 773.0 ms

    RESULT Interactive: SelectAll: Time= 654.4 ms
    median= 633.5 ms, stdev= 55.9223145368 ms, min= 600.0 ms, max= 769.0 ms

    RESULT Interactive: SelectAll: Time= 657.9 ms
    median= 640.0 ms, stdev= 54.1420159833 ms, min= 604.0 ms, max= 774.0 ms

* Interactive/SelectAll.html: Added.
* Skipped:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146997 268f45cc-cd09-0410-ab3c-d52691b4dbfc
3 files changed