Implement unicode bidi P2 and P3 rules in BidiResolver

Source/core/platform/graphics/TextRunIterator.h

 // Copyright (C) 2013 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:
 //
 //    * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //    * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
@@ skipping 40 matching lines @@
         : m_textRun(other.m_textRun)
         , m_offset(other.m_offset)
     {
     }
 
     unsigned offset() const { return m_offset; }
     void increment() { m_offset++; }
     bool atEnd() const { return !m_textRun || m_offset >= m_textRun->length(); }
     UChar current() const { return (*m_textRun)[m_offset]; }
     WTF::Unicode::Direction direction() const { return atEnd() ? WTF::Unicode::OtherNeutral : WTF::Unicode::direction(current()); }
+    bool atParagraphSeparator() const { return current() == '\n'; }
 
     bool operator==(const TextRunIterator& other)
     {
         return m_offset == other.m_offset && m_textRun == other.m_textRun;
     }
 
     bool operator!=(const TextRunIterator& other) { return !operator==(other); }
 
 private:
     const TextRun* m_textRun;
     int m_offset;
 };
 
 
 } // namespace WebCore
 
 #endif // TextRunIterator_h