https://bugs.webkit.org/show_bug.cgi?id=79208

Reviewed by Ryosuke Niwa.

PerformanceTests:

This patch adds performance micro-benchmarks for DOM attribute
getters and setters. We selected DOM attributes from HTMLElement,
Element and Node which will most impact on the DOM performance
in the real Web and which have different call-paths from another
DOM attribute.

The perf test result in my local Chromium/Linux environment is as follows:
median= 14967.0 ms, stdev= 85.2385476178 ms, min= 14861.0 ms, max= 15155.0 ms

If we run the test with DumpRenderTree, we can get the following test results:
Info: [HTMLElement.id] avg=65.76ms, median=65.00ms, stdev=2.14ms, min=63, max=70
Info: [HTMLElement.title] avg=64.05ms, median=63.00ms, stdev=1.50ms, min=63, max=67
Info: [HTMLElement.lang] avg=64.19ms, median=63.00ms, stdev=1.82ms, min=62, max=67
Info: [HTMLElement.dir] avg=64.10ms, median=63.00ms, stdev=1.72ms, min=62, max=68
Info: [HTMLElement.className] avg=63.33ms, median=63.00ms, stdev=0.89ms, min=63, max=67
Info: [HTMLElement.classList] avg=1946.00ms, median=1945.00ms, stdev=38.22ms, min=1921, max=2110
Info: [HTMLElement.tabIndex] avg=83.52ms, median=80.00ms, stdev=6.00ms, min=79, max=94
Info: [HTMLElement.draggable] avg=78.14ms, median=81.00ms, stdev=3.51ms, min=74, max=82
Info: [HTMLElement.webkitdropzone] avg=64.33ms, median=63.00ms, stdev=1.98ms, min=63, max=68
Info: [HTMLElement.hidden] avg=65.57ms, median=64.00ms, stdev=3.27ms, min=63, max=71
Info: [HTMLElement.accessKey] avg=64.43ms, median=63.00ms, stdev=2.11ms, min=62, max=68
Info: [HTMLElement.children] avg=130.76ms, median=128.00ms, stdev=9.75ms, min=109, max=143
Info: [HTMLElement.isContentEditable] avg=74.29ms, median=75.00ms, stdev=2.00ms, min=71, max=77
Info: [HTMLElement.spellcheck] avg=79.52ms, median=80.00ms, stdev=2.52ms, min=76, max=82
Info: [HTMLElement.innerHTML] avg=279.05ms, median=279.00ms, stdev=1.96ms, min=276, max=283
Info: [HTMLElement.innerText] avg=204.14ms, median=203.00ms, stdev=2.95ms, min=200, max=210
Info: [HTMLElement.outerHTML] avg=1544.10ms, median=1546.00ms, stdev=15.56ms, min=1514, max=1568
Info: [HTMLElement.outerText] avg=216.05ms, median=207.00ms, stdev=18.19ms, min=201, max=247
Info: [HTMLElement.contentEditable] avg=334.24ms, median=323.00ms, stdev=36.06ms, min=318, max=446
Info: [HTMLElement.id="foo"] avg=53.19ms, median=53.00ms, stdev=1.76ms, min=52, max=58
Info: [HTMLElement.title="foo"] avg=63.14ms, median=63.00ms, stdev=0.35ms, min=63, max=64
Info: [HTMLElement.lang="foo"] avg=60.86ms, median=61.00ms, stdev=0.56ms, min=60, max=62
Info: [HTMLElement.dir="foo"] avg=53.57ms, median=54.00ms, stdev=0.58ms, min=53, max=55
Info: [HTMLElement.className="foo"] avg=64.52ms, median=64.00ms, stdev=0.91ms, min=63, max=66
Info: [HTMLElement.tabIndex="foo"] avg=367.86ms, median=369.00ms, stdev=8.06ms, min=352, max=380
Info: [HTMLElement.draggable="foo"] avg=79.43ms, median=79.00ms, stdev=0.58ms, min=79, max=81
Info: [HTMLElement.webkitdropzone="foo"] avg=62.14ms, median=62.00ms, stdev=0.35ms, min=62, max=63
Info: [HTMLElement.hidden="foo"] avg=61.67ms, median=62.00ms, stdev=0.71ms, min=61, max=64
Info: [HTMLElement.accessKey="foo"] avg=61.86ms, median=62.00ms, stdev=0.56ms, min=61, max=63
Info: [HTMLElement.spellcheck="foo"] avg=79.57ms, median=80.00ms, stdev=0.58ms, min=78, max=80
Info: [HTMLElement.innerHTML="foo"] avg=1176.67ms, median=1169.00ms, stdev=26.60ms, min=1146, max=1246
Info: [HTMLElement.innerText="foo"] avg=51.62ms, median=52.00ms, stdev=0.72ms, min=50, max=53
Info: [Element.tagName] avg=79.52ms, median=80.00ms, stdev=1.05ms, min=78, max=81
Info: [Element.style] avg=126.19ms, median=126.00ms, stdev=10.40ms, min=104, max=161
Info: [Element.offsetLeft] avg=98.95ms, median=104.00ms, stdev=4.01ms, min=100, max=99
Info: [Element.clientLeft] avg=98.33ms, median=102.00ms, stdev=2.59ms, min=100, max=99
Info: [Element.scrollLeft] avg=103.29ms, median=96.00ms, stdev=15.63ms, min=100, max=97
Info: [Element.dataset] avg=2448.62ms, median=2441.00ms, stdev=20.43ms, min=2426, max=2503
Info: [Element.firstElementChild] avg=58.71ms, median=58.00ms, stdev=2.37ms, min=57, max=65
Info: [Element.lastElementChild] avg=56.33ms, median=55.00ms, stdev=1.83ms, min=54, max=59
Info: [Element.previousElementSibling] avg=52.95ms, median=52.00ms, stdev=1.70ms, min=52, max=57
Info: [Element.nextElementSibling] avg=58.48ms, median=58.00ms, stdev=1.79ms, min=57, max=63
Info: [Element.childElementCount] avg=64.57ms, median=64.00ms, stdev=1.81ms, min=63, max=71
Info: [Element.onload] avg=98.38ms, median=98.00ms, stdev=0.49ms, min=98, max=99
Info: [Element.scrollLeft="foo"] avg=95.24ms, median=95.00ms, stdev=0.92ms, min=94, max=98
Info: [Element.onload="foo"] avg=67.14ms, median=67.00ms, stdev=0.56ms, min=66, max=68
Info: [Node.nodeName] avg=76.29ms, median=76.00ms, stdev=0.63ms, min=75, max=77
Info: [Node.nodeType] avg=53.05ms, median=52.00ms, stdev=2.61ms, min=52, max=61
Info: [Node.parentNode] avg=53.52ms, median=53.00ms, stdev=1.22ms, min=52, max=56
Info: [Node.childNodes] avg=118.33ms, median=123.00ms, stdev=8.85ms, min=107, max=129
Info: [Node.firstChild] avg=53.62ms, median=53.00ms, stdev=1.13ms, min=51, max=55
Info: [Node.lastChild] avg=53.14ms, median=53.00ms, stdev=1.21ms, min=52, max=55
Info: [Node.previousSibling] avg=51.86ms, median=51.00ms, stdev=1.55ms, min=50, max=54
Info: [Node.nextSibling] avg=52.86ms, median=54.00ms, stdev=1.81ms, min=50, max=55
Info: [Node.attributes] avg=2027.71ms, median=2026.00ms, stdev=10.48ms, min=2010, max=2051
Info: [Node.ownerDocument] avg=152.14ms, median=152.00ms, stdev=1.73ms, min=149, max=155
Info: [Node.namespaceURI] avg=60.86ms, median=59.00ms, stdev=3.85ms, min=56, max=66
Info: [Node.localName] avg=60.00ms, median=59.00ms, stdev=2.71ms, min=57, max=66
Info: [Node.baseURI] avg=671.10ms, median=668.00ms, stdev=10.66ms, min=659, max=706
Info: [Node.parentElement] avg=55.05ms, median=56.00ms, stdev=2.15ms, min=52, max=58
Info: [Node.nodeValue] avg=61.24ms, median=60.00ms, stdev=2.56ms, min=59, max=68
Info: [Node.prefix] avg=60.90ms, median=58.00ms, stdev=4.26ms, min=57, max=68
Info: [Node.textContent] avg=149.71ms, median=149.00ms, stdev=1.12ms, min=148, max=152
Info: [Node.nodeValue="foo"] avg=23.62ms, median=23.00ms, stdev=0.72ms, min=23, max=25
Info: [Node.prefix="foo"] avg=49.57ms, median=49.00ms, stdev=0.73ms, min=49, max=51
Info: [Node.textContent="foo"] avg=145.81ms, median=140.00ms, stdev=17.43ms, min=138, max=199

* Bindings/dom_attributes.html: Added.
* resources/runner.js:
(PerfTestRunner.info):

Tools:

We want to allow perf tests to output info messages
that do not affect the test results. To accomplish this,
this patch modifies perftestsrunner.py so that it ignores
a line that starts from "Info:".

* Scripts/webkitpy/performance_tests/perftestsrunner.py:
(PerfTestsRunner):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108748 268f45cc-cd09-0410-ab3c-d52691b4dbfc