Treat inert nodes as aria-hidden instead of aria-disabled.

Source/core/accessibility/AXObject.cpp

Index: Source/core/accessibility/AXObject.cpp
diff --git a/Source/core/accessibility/AXObject.cpp b/Source/core/accessibility/AXObject.cpp
index 074c7a6c3fcc18cc179b4807dbaef8fc0dcf1f5c..a96bfc7975110cf658f7e7fc2a70b4ee692568f4 100644
--- a/Source/core/accessibility/AXObject.cpp
+++ b/Source/core/accessibility/AXObject.cpp
@@ -278,7 +278,7 @@ AXObjectInclusion AXObject::accessibilityPlatformIncludesObject() const
 
 AXObjectInclusion AXObject::defaultObjectInclusion() const
 {
-    if (ariaIsHidden())
+    if (isInertOrAriaHidden())
         return IgnoreObject;
 
     if (isPresentationalChildOfAriaRole())
@@ -287,6 +287,21 @@ AXObjectInclusion AXObject::defaultObjectInclusion() const
     return accessibilityPlatformIncludesObject();
 }
 
+bool AXObject::isInertOrAriaHidden() const
+{
+    if (equalIgnoringCase(getAttribute(aria_hiddenAttr), "true"))
+        return true;
+    if (node() && node()->isInert())
+        return true;
+
+    for (AXObject* object = parentObject(); object; object = object->parentObject()) {
+        if (equalIgnoringCase(object->getAttribute(aria_hiddenAttr), "true"))
+            return true;
+    }
+
+    return false;
+}
+
 bool AXObject::lastKnownIsIgnoredValue()
 {
     if (m_lastKnownIsIgnoredValue == DefaultBehavior)
@@ -896,17 +911,4 @@ AccessibilityRole AXObject::buttonRoleType() const
     return ButtonRole;
 }
 
-bool AXObject::ariaIsHidden() const
-{
-    if (equalIgnoringCase(getAttribute(aria_hiddenAttr), "true"))
-        return true;
-
-    for (AXObject* object = parentObject(); object; object = object->parentObject()) {
-        if (equalIgnoringCase(object->getAttribute(aria_hiddenAttr), "true"))
-            return true;
-    }
-
-    return false;
-}
-
 } // namespace WebCore