[blink/mac] Support getting baseline point for showing dictionary lookup bubble.

public/web/mac/WebSubstringUtil.h

 /*
  * Copyright (C) 2011 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
@@ skipping 42 matching lines @@
     // AppKit coordinates.
     BLINK_EXPORT static NSAttributedString* attributedWordAtPoint(WebView*,
         WebPoint,
         WebPoint& baselinePoint);
 
     // Returns an autoreleased NSAttributedString that is a substring of the
     // Frame at the given range, or nil on error.
     BLINK_EXPORT static NSAttributedString* attributedSubstringInRange(WebLocalFrame*,
         size_t location,
         size_t length);
+
+    // Returns an autoreleased NSAttributedString that is a substring of the
+    // Frame at the given range, or nil on error.
+    // It also gets the baseline point for the given range for showing
+    // dictionary lookup bubble.
+    BLINK_EXPORT static NSAttributedString* attributedSubstringInRange(WebLocalFrame*,
+        size_t location,
+        size_t length,
+        WebPoint* baselinePoint);
 };
 
 } // namespace blink
 
 #endif