Add multiline braille support.

chrome/common/extensions/api/braille_display_private.idl

 // Copyright 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.
 
 // Braille display access private API.
 namespace brailleDisplayPrivate {
   // Braille display keyboard command.
   enum KeyCommand {
     line_up,
     line_down,
@@ skipping 33 matching lines @@
     // Whether the shift key was pressed.
     boolean? shiftKey;
     // Whether the ctrl key was pressed.
     boolean? ctrlKey;
   };
 
   // The current braille display state.
   dictionary DisplayState {
     // Whether a braille display is currently available.
     boolean available;
-    // Number of braille cells on the currently connected display.
-    long? textCellCount;
+    // Number of rows of braille cells on the currently connected display.
+    long? textRowCount;
+    // Number of columns of braille cells on the currently connected display.
+    long? textColumnCount;
   };
 
   callback DisplayStateCallback = void(DisplayState result);
 
   interface Functions {
     // Gets the current display state.
     static void getDisplayState(DisplayStateCallback callback);
     // Write the given dot patterns to the display.  The buffer contains one
     // byte for each braille cell on the display, starting from the leftmost
     // cell. Each byte contains a bit pattern indicating which dots should be
     // raised in the corresponding cell with the low-order bit representing
     // dot 1 and so on until bit 7 which corresponds to dot 8.  If the number
     // of bytes in the buffer is not equal to the display size, the buffer
     // will either be clipped or padded with blank cells on the right.
-    static void writeDots(ArrayBuffer cells);
+    static void writeDots(ArrayBuffer cells, long columns, long rows);

[Devlin, 2016/10/18 23:01:29]

document new params columns and rows?

[ultimatedbz, 2016/10/20 18:27:45]

Done.

   };
 
   interface Events {
     // Fired when a braille display is connected or disconnected.
     static void onDisplayStateChanged(DisplayState state);
     // Fired when an input event is received from the display.
     static void onKeyEvent(KeyEvent event);
   };
 };