Introduce use counters for shadow DOM handling in plainText()

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 1127 matching lines @@
     }
 
     // Set the remaining style as the typing style.
     frame().selection().setTypingStyle(typingStyle);
 }
 
 bool Editor::findString(const String& target, FindOptions options)
 {
     VisibleSelection selection = frame().selection().selection();
 
-    RefPtrWillBeRawPtr<Range> resultRange = rangeOfString(target, selection.firstRange().get(), options);
+    RefPtrWillBeRawPtr<Range> resultRange = rangeOfString(target, selection.firstRange().get(), static_cast<FindOptions>(options | FindAPICall));
 
     if (!resultRange)
         return false;
 
     frame().selection().setSelection(VisibleSelection(resultRange.get(), DOWNSTREAM));
     frame().selection().revealSelection();
     return true;
 }
 
 PassRefPtrWillBeRawPtr<Range> Editor::findStringAndScrollToVisible(const String& target, Range* previousMatch, FindOptions options)
@@ skipping 108 matching lines @@
 }
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace blink