Add functions searching a word boundary without VisualPosition to HTMLTextFormControlElement.

Source/core/html/HTMLTextFormControlElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010, 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 69 matching lines @@
 
     void selectionChanged(bool userTriggered);
     bool lastChangeWasUserEdit() const;
     virtual void setInnerEditorValue(const String&);
     String innerEditorValue() const;
 
     String directionForFormData() const;
 
     void setTextAsOfLastFormControlChangeEvent(const String& text) { m_textAsOfLastFormControlChangeEvent = text; }
 
+    // These functions doesn't cause synchronous layout and will be used from SpellChecher for perfermance improvement.

[tkent, 2014/07/08 01:50:10]

doesn't -> don't
I think |will| is unnecessary.  -> SpellChecker uses them to improve
performance.

Also, I recommend to wrap the comment in 80 columns.

[yoichio, 2014/07/08 02:31:23]

Done.

+    // Passed |Position| must point inside of a text form control.
+    static Position startOfWord(const Position&);
+    static Position endOfWord(const Position&);
+    static Position startOfSentence(const Position&);
+    static Position endOfSentence(const Position&);
+
 protected:
     HTMLTextFormControlElement(const QualifiedName&, Document&, HTMLFormElement*);
     bool isPlaceholderEmpty() const;
     virtual void updatePlaceholderText() = 0;
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     void cacheSelection(int start, int end, TextFieldSelectionDirection direction)
     {
         ASSERT(start >= 0);
@@ skipping 44 matching lines @@
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLTextFormControlElement);
 
 HTMLTextFormControlElement* enclosingTextFormControl(const Position&);
 HTMLTextFormControlElement* enclosingTextFormControl(Node*);
 
 } // namespace
 
 #endif