[webkit-dev] PSA: Comparing perf. tests results just got easier

[Ryosuke Niwa]

Hi,

I've added run-perf-tests the ability to aggregate results locally with
--output-json-path option.
This new feature is very useful when you want to compare performance test
results.

Say we have two WebKit checkouts:

   1. At revision X with a patch that may have regressed
   Dromaeo/dom-traverse.html
   2. At revision X without the patch

Then execute run-perf-tests with the said option as follows in both
checkouts:
run-perf-tests --output-json-path=~/perf-test-results.json
PerformanceTests/Dromaeo/dom-traverse.html

Just like that, ~/perf-test-results.html is generated with beautiful flot
graphs summarizing the results.
Sample results page:
https://bug-92575-attachments.webkit.org/attachment.cgi?id=155123.

Best,
Ryosuke Niwa
Software Engineer
Google Inc.
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