Move LeftPositionOf() and RightPositionOf() to SelectionModifierCharacter.cpp

third_party/WebKit/Source/core/editing/SelectionModifier.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple 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:
  * 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 80 matching lines @@
 
   Member<LocalFrame> frame_;
   VisibleSelection selection_;
   LayoutUnit x_pos_for_vertical_arrow_navigation_;
 
   DISALLOW_COPY_AND_ASSIGN(SelectionModifier);
 };
 
 LayoutUnit NoXPosForVerticalArrowNavigation();
 
+// Following functions are exported for using in SelectionModifier and
+// testing only.
+
+// TODO(yosin) Since return value of |leftPositionOf()| with |VisiblePosition|
+// isn't defined well on flat tree, we should not use it for a position in
+// flat tree.
+CORE_EXPORT VisiblePosition LeftPositionOf(const VisiblePosition&);
+CORE_EXPORT VisiblePositionInFlatTree
+LeftPositionOf(const VisiblePositionInFlatTree&);
+// TODO(yosin) Since return value of |rightPositionOf()| with |VisiblePosition|
+// isn't defined well on flat tree, we should not use it for a position in
+// flat tree.
+CORE_EXPORT VisiblePosition RightPositionOf(const VisiblePosition&);
+CORE_EXPORT VisiblePositionInFlatTree
+RightPositionOf(const VisiblePositionInFlatTree&);
+
 }  // namespace blink
 
 #endif  // SelectionModifier_h