Correct the activation of idle time spell checker on document attach

third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.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 1024 matching lines @@
 }
 
 // TODO(xiaochengh): This function is only used by unit tests. We should move it
 // to IdleSpellCheckCallback and modify unit tests to cope with idle time spell
 // checker.
 void SpellChecker::cancelCheck() {
   m_spellCheckRequester->cancelCheck();
 }
 
 void SpellChecker::documentAttached(Document* document) {
-  m_idleSpellCheckCallback->documentAttached(document);
+  if (RuntimeEnabledFeatures::idleTimeSpellCheckingEnabled())
+    m_idleSpellCheckCallback->documentAttached(document);
 }
 
 DEFINE_TRACE(SpellChecker) {
   visitor->trace(m_frame);
   visitor->trace(m_spellCheckRequester);
   visitor->trace(m_idleSpellCheckCallback);
 }
 
 void SpellChecker::prepareForLeakDetection() {
   m_spellCheckRequester->prepareForLeakDetection();
@@ skipping 133 matching lines @@
       if (!input.isFocusedElementInDocument())
         return false;
     }
   }
   HTMLElement* element =
       Traversal<HTMLElement>::firstAncestorOrSelf(*position.anchorNode());
   return element && element->isSpellCheckingEnabled();
 }
 
 }  // namespace blink