https://bugs.webkit.org/show_bug.cgi?id=93621

Reviewed by Chris Fleizach.

Source/WebCore:

Fix broken implementation of AtkText and AtkEditableText
interfaces in the GTK port for password input fields.

* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::stringValue): Call the new
function passwordFieldValue() for password input fields.
(WebCore::AccessibilityRenderObject::text): Ditto.
(WebCore::AccessibilityRenderObject::textLength): Return the
actual length of the password in the field for GTK, return -1
otherwise (not to break current behavior in other platforms).
(WebCore::AccessibilityRenderObject::doAXStringForRange): Don't
early return for password fields in GTK (will rely on text()).
(WebCore::AccessibilityRenderObject::passwordFieldValue): New, it
returns the text being actually rendered for a password input
field (normally a masked string) in GTK. It returns String() in
the rest of platforms, to ensure we don't break anything there.
(WebCore):
* accessibility/AccessibilityRenderObject.h:
(AccessibilityRenderObject):
* accessibility/AccessibilityObject.h:
(WebCore::AccessibilityObject::passwordFieldValue): Default
implementation of this new method, returning an empty string.
(AccessibilityObject):

Ensure the 'text-insert' and 'text-remove' signals for the AtkText
interface are properly emitted for password input fields.

* accessibility/gtk/AXObjectCacheAtk.cpp:
(WebCore::AXObjectCache::nodeTextChangePlatformNotification): Make
sure we never emit the password value for an input field in plain
text when inserting or removing text. Emit the masked text instead.

Source/WebKit/gtk:

Update unit test to ensure that password input fields behave
as expected when inserting and removing characters in them.

* tests/testatk.c:
(testWebkitAtkTextChangedNotifications): Updated unit test to
cover the special case of password input fields.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@125321 268f45cc-cd09-0410-ab3c-d52691b4dbfc