Make associatedLayoutObjectOf() to handle ::first-letter pseudo-element correctly

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

 /*
  * Copyright (C) 2004 Apple Computer, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 57 matching lines @@
         return !operator==(other);
     }
 };
 
 // The print for |InlineBoxPosition| is available only for testing
 // in "webkit_unit_tests", and implemented in
 // "core/editing/VisibleUnitsTest.cpp".
 std::ostream& operator<<(std::ostream&, const InlineBoxPosition&);
 
 // offset functions on Node
+CORE_EXPORT LayoutObject* associatedLayoutObjectOf(const Node&, int offsetInNode);

[tkent, 2016/01/29 00:56:09]

Is this |offset functions on Node|?

[yosin_UTC9, 2016/01/29 03:45:12]

Done.

 CORE_EXPORT int caretMinOffset(const Node*);
 CORE_EXPORT int caretMaxOffset(const Node*);
 
 // Position
 // mostForward/BackwardCaretPosition are used for moving back and forth between
 // visually equivalent candidates.
 // For example, for the text node "foo     bar" where whitespace is
 // collapsible, there are two candidates that map to the VisiblePosition
 // between 'b' and the space, after first space and before last space.
 //
@@ skipping 148 matching lines @@
 
 // Returns a hit-tested VisiblePosition for the given point in contents-space
 // coordinates.
 CORE_EXPORT VisiblePosition visiblePositionForContentsPoint(const IntPoint&, LocalFrame*);
 
 CORE_EXPORT bool rendersInDifferentPosition(const Position&, const Position&);
 
 } // namespace blink
 
 #endif // VisibleUnits_h