https://bugs.webkit.org/show_bug.cgi?id=101650

Reviewed by Chris Fleizach.

Source/WebCore:

Getting inner text from an element now ignores focusable descendants
and containers, but uses alternative text.  The computation of
textUnderElement is now recursive and doesn't depend on text
iterators, which might not do the right thing for accessibility
anyways.

For GTK, the old behavior is retained so that support for
the object replacement character is still there. Filed a new
bug (105214) for GTK folks to look at this.

Test: accessibility/button-title-uses-inner-img-alt.html
Test: accessibility/focusable-div.html

* accessibility/AccessibilityNodeObject.cpp:
(WebCore):
(WebCore::shouldUseAccessiblityObjectInnerText):
(WebCore::AccessibilityNodeObject::textUnderElement):
* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::textUnderElement):

LayoutTests:

Adds new tests to show that getting inner text from an element
now ignores focusable descendants and containers, but uses alternative
text.

Updates and rebaselines several tests to reflect the new logic.
Skips these tests on GTK until support for the object replacement
character can be added.

* accessibility/button-title-uses-inner-img-alt-expected.txt: Added.
* accessibility/button-title-uses-inner-img-alt.html: Added.
* accessibility/focusable-div-expected.txt: Extended with more test cases.
* accessibility/focusable-div.html: Extended with more test cases.
* platform/chromium/TestExpectations: Un-skip test that now passes.
* platform/chromium/accessibility/image-link-expected.txt: Rebaseline
* platform/mac/accessibility/image-link-expected.txt: Rebaseline
* platform/mac/accessibility/internal-link-anchors2-expected.txt: Rebaseline
* platform/mac/accessibility/static-text-role-uses-text-under-element-expected.txt: Rebaseline
* platform/mac/accessibility/static-text-role-uses-text-under-element.html: Fix
* platform/mac/accessibility/table-with-aria-role-expected.txt: Rebaseline
* platform/gtk/TestExpectations: Skip these tests until this feature is implemented for GTK.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@137946 268f45cc-cd09-0410-ab3c-d52691b4dbfc