Merge 129036 - AX: A few control types are returning the wrong answer for isReadOnly

Merge 129036 - AX: A few control types are returning the wrong answer for isReadOnly
https://bugs.webkit.org/show_bug.cgi?id=96735

Reviewed by Chris Fleizach.

Source/WebCore:

All input types should be read-only except ones that
are text fields. The previous logic was marking things like
checkboxes as not read-only.

Tests: platform/chromium/accessibility/readonly.html
       platform/mac/accessibility/form-control-value-settable.html

* accessibility/AccessibilityNodeObject.cpp:
(WebCore::AccessibilityNodeObject::isReadOnly):

Tools:

Exposing isReadOnly in an AccessibilityObject to DumpRenderTree.

* DumpRenderTree/chromium/TestRunner/AccessibilityUIElementChromium.cpp:
(AccessibilityUIElement::AccessibilityUIElement):
(AccessibilityUIElement::isReadOnlyGetterCallback):
* DumpRenderTree/chromium/TestRunner/AccessibilityUIElementChromium.h:
(AccessibilityUIElement):

LayoutTests:

Adds a new test to make sure that readonly is exposed correctly on
all elements.

* platform/chromium/accessibility/readonly-expected.txt: Added.
* platform/chromium/accessibility/readonly.html: Added.
* platform/mac/accessibility/form-control-value-settable-expected.txt: Added.
* platform/mac/accessibility/form-control-value-settable.html: Added.


TBR=dmazzoni@google.com
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=129415