Implement ThreadedInputConnection.deleteSurroundingTextInCodePoints()

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 103a23ed1515f094d3d18ebc38c7684a07a119ea..05c087cd1bca2f8233a9e4deeabb33d7ab926512 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -458,9 +458,16 @@ class CONTENT_EXPORT RenderFrameHostImpl
   void ExtendSelectionAndDelete(size_t before, size_t after);
 
   // Deletes text before and after the current cursor position, excluding the
-  // selection.
+  // selection. The lengths are supplied in Java chars (UTF-16 Code Unit), not
+  // in code points or in glyphs.
   void DeleteSurroundingText(size_t before, size_t after);
 
+  // Deletes text before and after the current cursor position, excluding the
+  // selection. The lengths are supplied in code points, not in Java chars
+  // (UTF-16 Code Unit) or in glyphs. Do nothing if there are one or more
+  // invalid surrogate pairs in the requested range.
+  void DeleteSurroundingTextInCodePoints(int before, int after);
+
   // Notifies the RenderFrame that the JavaScript message that was shown was
   // closed by the user.
   void JavaScriptDialogClosed(IPC::Message* reply_msg,