PerfTestRunner.run should take an object

PerfTestRunner.run should take an object
https://bugs.webkit.org/show_bug.cgi?id=97743

Reviewed by Kentaro Hara.

Rename PerfTestRunner.run to PerfTestRunner.measureTime and make it take an object instead of
5 arguments. Also get rid of PerfTestRunner._loopsPerRun since it's no longer used (it's always 1).

* CSS/StyleSheetInsert.html:
* DOM/resources/dom-perf.js:
* Layout/floats_100_100.html:
* Layout/floats_100_100_nested.html:
* Layout/floats_20_100.html:
* Layout/floats_20_100_nested.html:
* Layout/floats_2_100.html:
* Layout/floats_2_100_nested.html:
* Layout/floats_50_100.html:
* Layout/floats_50_100_nested.html:
* Parser/html-parser.html:
* Parser/html5-full-render.html:
* SVG/SvgCubics.html:
* SVG/SvgHitTesting.html:
* resources/runner.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129824 268f45cc-cd09-0410-ab3c-d52691b4dbfc