<rdar://problem/7672667> and https://bugs.webkit.org/show_bug.cgi?id=35556

Reviewed by Sam Weinig.

WebCore: 

Test: fast/loader/for-window-event-onload-scripts.html

Match Gecko's rules for executing "for/event" scripts:
  -If there's only a 'for' attribute, execute it.
  -If there's only an 'event' attribute, execute it.
  -If there's a 'for=window' and 'event=onload', execute it.
  -If there's a 'for=window' and 'event=onload()', execute it.
  -If there's any other combination of both 'for' and 'event', don't execute it.

* dom/ScriptElement.cpp:
(WebCore::ScriptElementData::shouldExecuteAsJavaScript):
* dom/ScriptElement.h:

* html/HTMLScriptElement.cpp:
(WebCore::HTMLScriptElement::eventAttributeValue):
* html/HTMLScriptElement.h:

* svg/SVGScriptElement.cpp:
(WebCore::SVGScriptElement::eventAttributeValue):
* svg/SVGScriptElement.h:

Add the event attribute name:
* html/HTMLAttributeNames.in:

LayoutTests: 

* fast/loader/for-window-event-onload-scripts-expected.txt: Added.
* fast/loader/for-window-event-onload-scripts.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55414 268f45cc-cd09-0410-ab3c-d52691b4dbfc