[CSS Shapes] Add performance test for complex polygon with shape-margin

[CSS Shapes] Add performance test for complex polygon with shape-margin
https://bugs.webkit.org/show_bug.cgi?id=128769

Reviewed by Ryosuke Niwa.

This patch modifies the logic of createShapeOutsideTest to accept multiple
CSS properties from the test. The patch adds performance test for complex
polygon shape (self intersecting at multiple places) case, moreover we
apply shape-margin on the polygon also.

* Layout/Shapes/ShapeOutsideContentBox.html:
* Layout/Shapes/ShapeOutsideInset.html:
* Layout/Shapes/ShapeOutsidePolygonWithMargin.html: Added.
* Layout/Shapes/ShapeOutsideRaster.html:
* Layout/Shapes/ShapeOutsideSimplePolygon.html:
* Layout/Shapes/resources/shapes.js:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@164078 268f45cc-cd09-0410-ab3c-d52691b4dbfc