Web Inspector: implement Flame Chart for CPU profiler.

Web Inspector: implement Flame Chart for CPU profiler.
https://bugs.webkit.org/show_bug.cgi?id=111162

Reviewed by Yury Semikhatsky.

It is an initial implementation. The next step is to provide
function names and other stats about the hovered item.

* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.vcxproj/WebCore.vcxproj:
* WebCore.vcxproj/WebCore.vcxproj.filters:
* inspector/compile-front-end.py:
* inspector/front-end/CPUProfileView.js:
(WebInspector.CPUProfileView.prototype._getCPUProfileCallback):
* inspector/front-end/FlameChart.js: Added.
(WebInspector.FlameChart):
(WebInspector.FlameChart.prototype._onMouseMove):
(WebInspector.FlameChart.prototype.findNodeCallback):
(WebInspector.FlameChart.prototype._coordinatesToNode):
(WebInspector.FlameChart.prototype.onResize):
(WebInspector.FlameChart.prototype._rootNodes):
(WebInspector.FlameChart.prototype.draw):
(WebInspector.FlameChart.prototype._drawNode):
(WebInspector.FlameChart.prototype._forEachNode):
(WebInspector.FlameChart.prototype._drawBar):
(WebInspector.FlameChart.prototype.update):
* inspector/front-end/Settings.js:
(WebInspector.ExperimentsSettings):
* inspector/front-end/WebKit.qrc:
* inspector/front-end/flameChart.css: Added.
(.flame-chart):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@144618 268f45cc-cd09-0410-ab3c-d52691b4dbfc