Source/WebCore: [ATK] Fix text inside "span" block in "a" block was not accessible.
https://bugs.webkit.org/show_bug.cgi?id=132349

Patch by Jarek Czekalski <jarekczek@poczta.onet.pl> on 2014-06-13
Reviewed by Mario Sanchez Prada.

* accessibility/atk/WebKitAccessibleWrapperAtk.cpp: Add link role
  to the list of roles whose objects always expose atk_text interface.

LayoutTests: [ATK] Add test for accessibility of text inside "span" block in "a" block.
https://bugs.webkit.org/show_bug.cgi?id=132349

Patch by Jarek Czekalski <jarekczek@poczta.onet.pl> on 2014-06-13
Reviewed by Mario Sanchez Prada.

* platform/gtk/accessibility/text-in-span-block-in-a-block-expected.txt: Added.
* platform/gtk/accessibility/text-in-span-block-in-a-block.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169936 268f45cc-cd09-0410-ab3c-d52691b4dbfc