Implement ThreadedInputConnection.deleteSurroundingTextInCodePoints()

third_party/WebKit/public/web/WebPlugin.h

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. 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.
@@ skipping 177 matching lines @@
   // selectionBehavior.
   virtual bool finishComposingText(
       WebInputMethodController::ConfirmCompositionBehavior selectionBehavior) {
     return false;
   }
 
   // Deletes the current selection plus the specified number of characters
   // before and after the selection or caret.
   virtual void extendSelectionAndDelete(int before, int after) {}
   // Deletes text before and after the current cursor position, excluding the
-  // selection.
+  // selection. The lengths are supplied in UTF-16 Code Unit, not in code points
+  // or in glyphs.
   virtual void deleteSurroundingText(int before, int after) {}
+  // Deletes text before and after the current cursor position, excluding the
+  // selection. The lengths are supplied in code points, not in UTF-16 Code Unit
+  // or in glyphs. Do nothing if there are one or more invalid surrogate pairs
+  // in the requested range.
+  virtual void deleteSurroundingTextInCodePoints(int before, int after) {}
   // If the given position is over a link, returns the absolute url.
   // Otherwise an empty url is returned.
   virtual WebURL linkAtPosition(const WebPoint& position) const {
     return WebURL();
   }
 
   // Find interface.
   // Start a new search.  The plugin should search for a little bit at a time so
   // that it doesn't block the thread in case of a large document.  The results,
   // along with the find's identifier, should be sent asynchronously to
@@ skipping 19 matching lines @@
 
   virtual bool isPlaceholder() { return true; }
 
  protected:
   ~WebPlugin() {}
 };
 
 }  // namespace blink
 
 #endif