Implement ThreadedInputConnection.deleteSurroundingTextInCodePoints()

content/common/input_messages.h

 // Copyright (c) 2013 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.
 
 // IPC messages for input events and other messages that require processing in
 // order relative to input events.
 // Multiply-included message file, hence no include guard.
 
 #include "base/strings/string16.h"
 #include "build/build_config.h"
@@ skipping 145 matching lines @@
     int /* end */,
     std::vector<blink::WebCompositionUnderline> /* underlines */)
 
 // Deletes the current selection plus the specified number of characters before
 // and after the selection or caret.
 IPC_MESSAGE_ROUTED2(InputMsg_ExtendSelectionAndDelete,
                     int /* before */,
                     int /* 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.
 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 (UTF-16
+// Code Unit) or in glyphs. Do nothing if there are one or more invalid

[dcheng, 2017/02/25 07:37:03]

Nit: Do nothing => Does nothing

[yabinh, 2017/02/27 02:04:33]

Done.

+// 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,
                     int /* start */,
                     int /* end */)
 
 // This message sends a string being composed with an input method.
 IPC_MESSAGE_ROUTED5(
     InputMsg_ImeSetComposition,
     base::string16, /* text */
@@ skipping 143 matching lines @@
 // This IPC message sends the character bounds after every composition change
 // to always have correct bound info.
 IPC_MESSAGE_ROUTED2(InputHostMsg_ImeCompositionRangeChanged,
                     gfx::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent InputMsg, then ifdefs for platform specific InputMsg, then
 // platform independent InputHostMsg, then ifdefs for platform specific
 // InputHostMsg.