Extract buildAccessibilityTree() from the individual layout test.

LayoutTests/resources/accessibility-helper.js

Index: LayoutTests/resources/accessibility-helper.js
diff --git a/LayoutTests/resources/accessibility-helper.js b/LayoutTests/resources/accessibility-helper.js
new file mode 100644
index 0000000000000000000000000000000000000000..66235a3cd9e52d62f80263c987eb56b1007f48ef
--- /dev/null
+++ b/LayoutTests/resources/accessibility-helper.js
@@ -0,0 +1,30 @@
+function buildAccessibilityTree(accessibilityObject, indent, allAttributesRequired, rolesToIgnore, targetObject, targetString) {
+    if (rolesToIgnore) {
+        for (var i = 0; i < rolesToIgnore.length; i++) {
+            if (accessibilityObject.role  == 'AXRole: ' + rolesToIgnore[i])
+                return true;
+        }
+    }
+
+    var str = "";
+    for (var i = 0; i < indent; i++)
+        str += "    ";
+    str += accessibilityObject.role;
+    str += " " + accessibilityObject.stringValue;
+    str += allAttributesRequired && accessibilityObject.role == '' ? accessibilityObject.allAttributes() : '';
+    str += targetObject && accessibilityObject.isEqual(targetObject) ? "     " + targetString : '';
+    str += "\n";
+
+    document.getElementById("console").innerText += str;
+
+    if (accessibilityObject.stringValue.indexOf('End of test') >= 0)
+        return false;
+
+    var count = accessibilityObject.childrenCount;
+    for (var i = 0; i < count; i++) {
+        if (!buildAccessibilityTree(accessibilityObject.childAtIndex(i), indent + 1, allAttributesRequired, rolesToIgnore, targetObject, targetString))
+            return false;
+    }
+
+    return true;
+}