Add support for persisting CompositionUnderlines in InputMethodController

third_party/WebKit/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 1195 matching lines @@
     switch (marker->type()) {
       case DocumentMarker::Spelling:
       case DocumentMarker::Grammar:
       case DocumentMarker::TextMatch:
         markerTypes.append(marker->type());
         markerRanges.append(
             AXRange(marker->startOffset(), marker->endOffset()));
         break;
       case DocumentMarker::InvisibleSpellcheck:
       case DocumentMarker::Composition:
+      case DocumentMarker::PersistingComposition:
         // No need for accessibility to know about these marker types.
         break;
     }
   }
 }
 
 AccessibilityOrientation AXNodeObject::orientation() const {
   const AtomicString& ariaOrientation = getAttribute(aria_orientationAttr);
   AccessibilityOrientation orientation = AccessibilityOrientationUndefined;
   if (equalIgnoringCase(ariaOrientation, "horizontal"))
@@ skipping 1666 matching lines @@
     return String();
   return toTextControlElement(node)->strippedPlaceholder();
 }
 
 DEFINE_TRACE(AXNodeObject) {
   visitor->trace(m_node);
   AXObject::trace(visitor);
 }
 
 }  // namespace blink