Implement ThreadedInputConnection.deleteSurroundingTextInCodePoints()

content/common/input_messages.h

Index: content/common/input_messages.h
diff --git a/content/common/input_messages.h b/content/common/input_messages.h
index 7221f95d3d31c18cd2cfd6877c938d8ccab62dbe..95619f62f00bdd979a28c79d92cd54fef769fa8e 100644
--- a/content/common/input_messages.h
+++ b/content/common/input_messages.h
@@ -163,11 +163,20 @@ IPC_MESSAGE_ROUTED2(InputMsg_ExtendSelectionAndDelete,
                     int /* after */)
 
 // Deletes text before and after the current cursor position, excluding the
-// selection.
+// selection. The lengths are supplied in Java chars, not in code points or in
+// glyphs.
 IPC_MESSAGE_ROUTED2(InputMsg_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 Java chars or in
+// glyphs. Do nothing if there are one or more invalid surrogate pairs in the
+// requested range
+IPC_MESSAGE_ROUTED2(InputMsg_DeleteSurroundingTextInCodePoints,
+                    int /* before */,
+                    int /* after */)
+
 // Selects between the given start and end offsets in the currently focused
 // editable field.
 IPC_MESSAGE_ROUTED2(InputMsg_SetEditableSelectionOffsets,