Expose scroll containers via accessibility APIs.

Source/web/WebAXObject.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1505 matching lines @@
     WebVector<int> startsWebVector(words.size());
     WebVector<int> endsWebVector(words.size());
     for (size_t i = 0; i < words.size(); i++) {
         startsWebVector[i] = words[i].start;
         endsWebVector[i] = words[i].start + words[i].length;
     }
     starts.swap(startsWebVector);
     ends.swap(endsWebVector);
 }
 
+bool WebAXObject::isScrollableContainer() const
+{
+    if (isDetached())
+        return false;
+
+    return m_private->isScrollableContainer();
+}
+
+WebPoint WebAXObject::scrollOffset() const
+{
+    if (isDetached())
+        return WebPoint();
+
+    return m_private->scrollOffset();
+}
+
+WebPoint WebAXObject::minimumScrollOffset() const
+{
+    if (isDetached())
+        return WebPoint();
+
+    return m_private->minimumScrollOffset();
+}
+
+WebPoint WebAXObject::maximumScrollOffset() const
+{
+    if (isDetached())
+        return WebPoint();
+
+    return m_private->maximumScrollOffset();
+}
+
+void WebAXObject::setScrollOffset(const WebPoint& offset) const
+{
+    if (isDetached())
+        return;
+
+    m_private->setScrollOffset(offset);
+}
+
 void WebAXObject::scrollToMakeVisible() const
 {
     if (!isDetached())
         m_private->scrollToMakeVisible();
 }
 
 void WebAXObject::scrollToMakeVisibleWithSubFocus(const WebRect& subfocus) const
 {
     if (!isDetached())
         m_private->scrollToMakeVisibleWithSubFocus(subfocus);
@@ skipping 15 matching lines @@
     m_private = object;
     return *this;
 }
 
 WebAXObject::operator WTF::PassRefPtr<AXObject>() const
 {
     return m_private.get();
 }
 
 } // namespace blink