Introducing new API placeHolder() to expose placeholder attribute on MAC

Source/modules/accessibility/AXNodeObject.cpp

Index: Source/modules/accessibility/AXNodeObject.cpp
diff --git a/Source/modules/accessibility/AXNodeObject.cpp b/Source/modules/accessibility/AXNodeObject.cpp
index c6d89e66e6aa230d378bf8a292a074ba5d8674b2..846c9a432f0f383640b781b1777bf9a10605a63e 100644
--- a/Source/modules/accessibility/AXNodeObject.cpp
+++ b/Source/modules/accessibility/AXNodeObject.cpp
@@ -965,6 +965,15 @@ String AXNodeObject::ariaAutoComplete() const
     return String();
 }
 
+String AXNodeObject::placeHolder() const
+{
+    if (node() && (isHTMLInputElement(*node()) || isHTMLTextAreaElement(*node()))) {
+        if (hasAttribute(placeholderAttr))

[aboxhall, 2014/12/18 04:17:54]

This should be something like:

HTMLInputElement* inputElement = toHTMLInputElement(node);
String placeholder = inputElement->strippedPlaceholder();
if (!placeholder.isEmpty())
    return placeholder;

This way you're guaranteed to only get a placeholder string when the attribute
is supported (consider <input type="range"> for example).

+            return getAttribute(placeholderAttr);
+    }
+    return String();
+}
+
 String AXNodeObject::text() const
 {
     // If this is a user defined static text, use the accessible name computation.