Add functions searching a word boundary without VisualPosition to HTMLTextFormControlElement.

Source/core/html/HTMLTextFormControlElement.h

Index: Source/core/html/HTMLTextFormControlElement.h
diff --git a/Source/core/html/HTMLTextFormControlElement.h b/Source/core/html/HTMLTextFormControlElement.h
index 6d1c5921f2faf1f00991e1d57d71b22755c95255..75d0afa018392d3ec2751afdfcc5c60f79b68c87 100644
--- a/Source/core/html/HTMLTextFormControlElement.h
+++ b/Source/core/html/HTMLTextFormControlElement.h
@@ -87,6 +87,13 @@ public:
 
     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;