An element with role=textbox should have settable AXValue unless read-only

An element with role=textbox should have settable AXValue unless read-only
https://bugs.webkit.org/show_bug.cgi?id=65664

Patch by Alice Boxhall <aboxhall@chromium.org> on 2011-08-03
Reviewed by Chris Fleizach.

Source/WebCore:

* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::canSetValueAttribute):
Return true for non-native text field with aria-readonly not set.

LayoutTests:

* accessibility/aria-readonly-expected.txt:
* accessibility/aria-readonly.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@92352 268f45cc-cd09-0410-ab3c-d52691b4dbfc