[webkit-dev] Accessibility in WK2 update

[Chris Fleizach]

Just landed a large patch to make accessibility work in WK2

http://trac.webkit.org/changeset/75031

There were some changes that may have implications for other platforms, so if you work on accessibility read on.

• I replaced the getOrCreate method in AXObjectCache with rootObject, so that there's no ambiguity about how to get the top of the AX tree from WebKit/WK2.

• I made the root object be the ScrollView containing the RenderView (web area). The AX object representing the ScrollView is now handled by AccessibilityScrollView, instead of platform scroll views. This was needed because there are no platform scroll views in WK2. 

• The AccessibilityScrollView has 3 children, the 2 scroll bars (if visible) and the web area.

If any of these changes don't jive with your platform feel free to submit patches and I'll review them promptly.

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