Handle AX help-Text for media time slider.

Source/modules/accessibility/AXNodeObject.cpp

 /*
 * Copyright (C) 2012, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 20 matching lines @@
 
 #include "core/InputTypeNames.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/html/HTMLDListElement.h"
 #include "core/html/HTMLFieldSetElement.h"
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLabelElement.h"
 #include "core/html/HTMLLegendElement.h"
+#include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/HTMLSelectElement.h"
 #include "core/html/HTMLTextAreaElement.h"
+#include "core/html/shadow/MediaControlElements.h"
 #include "core/rendering/RenderObject.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 #include "platform/UserGestureIndicator.h"
 #include "wtf/text/StringBuilder.h"
 
 
 namespace blink {
 
 using namespace HTMLNames;
 
@@ skipping 454 matching lines @@
 bool AXNodeObject::isControl() const
 {
     Node* node = this->node();
     if (!node)
         return false;
 
     return ((node->isElementNode() && toElement(node)->isFormControlElement())
         || AXObject::isARIAControl(ariaRoleAttribute()));
 }
 
+bool AXNodeObject::isControllingVideoElement() const
+{
+    Node* node = this->node();
+    if (!node)
+        return true;
+
+    return isHTMLVideoElement(toParentMediaElement(node));
+}
+
 bool AXNodeObject::isEmbeddedObject() const
 {
     return isHTMLPlugInElement(node());
 }
 
 bool AXNodeObject::isFieldset() const
 {
     return isHTMLFieldSetElement(node());
 }
 
@@ skipping 1275 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCacheImpl::AXValueChanged, true);
 }
 
 } // namespace blink