https://bugs.webkit.org/show_bug.cgi?id=117561

Reviewed by Anders Carlsson.

Source/WebKit: 

* WebKit.vcxproj/Interfaces/Interfaces.vcxproj: Add new IAccessible2 IDL files.
* WebKit.vcxproj/Interfaces/Interfaces.vcxproj.filters: Ditto.
* WebKit.vcxproj/Interfaces/InterfacesCommon.props: Reference new Accessible2 folder.
* WebKit.vcxproj/WebKitGUID/WebKitGUID.vcxproj: Build IAccessible2 symbols.
* WebKit.vcxproj/WebKitGUID/WebKitGUID.vcxproj.filters: Ditto.

Source/WebKit/win: 

* AccessibleBase.cpp: Add stubs for IAccessible2 interface, replace attributeValue
method with get_attribute from IAccessible2 API.
* AccessibleBase.h: Ditto.
* AccessibleDocument.cpp: Revise signatures for IAccessible2.
* AccessibleDocument.h: Ditto.
* AccessibleImage.cpp: Revise signatures for IAccessible2.
* AccessibleImage.h: Ditto.
* Interfaces/Accessible2: Added.
* Interfaces/Accessible2/Accessible2.idl: Added.
* Interfaces/Accessible2/Accessible2_2.idl: Added.
* Interfaces/Accessible2/AccessibleApplication.idl: Added.
* Interfaces/Accessible2/AccessibleRelation.idl: Added.
* Interfaces/Accessible2/AccessibleStates.idl: Added.
* Interfaces/Accessible2/IA2CommonTypes.idl: Added.
* Interfaces/AccessibleComparable.idl:
* Interfaces/WebKit.idl: Reference IAccessible2 types.
* WebFrame.cpp: 
(WebFrame::accessible): Pass window handle to IAccessible types.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151529 268f45cc-cd09-0410-ab3c-d52691b4dbfc