Implement ThreadedInputConnection.deleteSurroundingTextInCodePoints()

third_party/WebKit/public/web/WebLocalFrame.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebLocalFrame_h
 #define WebLocalFrame_h
 
 #include <set>
 #include "WebCompositionUnderline.h"
 #include "WebFrame.h"
@@ skipping 322 matching lines @@
 
   virtual void setCaretVisible(bool) = 0;
 
   // Moves the selection extent point. This function does not allow the
   // selection to collapse. If the new extent is set to the same position as
   // the current base, this function will do nothing.
   virtual void moveRangeSelectionExtent(const WebPoint&) = 0;
   // Replaces the selection with the input string.
   virtual void replaceSelection(const WebString&) = 0;
   // 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) = 0;
+  // A variant of deleteSurroundingText(int, int). Major differences are:
+  // 1. The lengths are supplied in code points, not in UTF-16 Code Unit or in
+  // glyphs.
+  // 2. This method does nothing if there are one or more invalid surrogate
+  // pairs in the requested range.
+  virtual void deleteSurroundingTextInCodePoints(int before, int after) = 0;
 
   virtual void extractSmartClipData(WebRect rectInViewport,
                                     WebString& clipText,
                                     WebString& clipHtml) = 0;
 
   // Spell-checking support -------------------------------------------------
   virtual void replaceMisspelledRange(const WebString&) = 0;
   virtual void enableSpellChecking(bool) = 0;
   virtual bool isSpellCheckingEnabled() const = 0;
   virtual void removeSpellingMarkers() = 0;
@@ skipping 154 matching lines @@
   // to call these on a WebLocalFrame.
   bool isWebLocalFrame() const override = 0;
   WebLocalFrame* toWebLocalFrame() override = 0;
   bool isWebRemoteFrame() const override = 0;
   WebRemoteFrame* toWebRemoteFrame() override = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebLocalFrame_h