MD Settings: Add remapping options for Backspace and Escape

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 509 matching lines @@
                           arraysize(pointers_strings));
 
   LocalizedString keyboard_strings[] = {
       {"keyboardTitle", IDS_SETTINGS_KEYBOARD_TITLE},
       {"keyboardKeySearch", IDS_SETTINGS_KEYBOARD_KEY_SEARCH},
       {"keyboardKeyCtrl", IDS_SETTINGS_KEYBOARD_KEY_LEFT_CTRL},
       {"keyboardKeyAlt", IDS_SETTINGS_KEYBOARD_KEY_LEFT_ALT},
       {"keyboardKeyCapsLock", IDS_SETTINGS_KEYBOARD_KEY_CAPS_LOCK},
       {"keyboardKeyDiamond", IDS_SETTINGS_KEYBOARD_KEY_DIAMOND},
       {"keyboardKeyEscape", IDS_SETTINGS_KEYBOARD_KEY_ESCAPE},
+      {"keyboardKeyBackspace", IDS_SETTINGS_KEYBOARD_KEY_BACKSPACE},
       {"keyboardKeyDisabled", IDS_SETTINGS_KEYBOARD_KEY_DISABLED},
       {"keyboardSendFunctionKeys", IDS_SETTINGS_KEYBOARD_SEND_FUNCTION_KEYS},
       {"keyboardSendFunctionKeysDescription",
        IDS_SETTINGS_KEYBOARD_SEND_FUNCTION_KEYS_DESCRIPTION},
       {"keyboardEnableAutoRepeat", IDS_SETTINGS_KEYBOARD_AUTO_REPEAT_ENABLE},
       {"keyRepeatDelay", IDS_SETTINGS_KEYBOARD_AUTO_REPEAT_DELAY},
       {"keyRepeatDelayLong", IDS_SETTINGS_KEYBOARD_AUTO_REPEAT_DELAY_LONG},
       {"keyRepeatDelayShort", IDS_SETTINGS_KEYBOARD_AUTO_REPEAT_DELAY_SHORT},
       {"keyRepeatRate", IDS_SETTINGS_KEYBOARD_AUTO_REPEAT_RATE},
       {"keyRepeatRateSlow", IDS_SETTINGS_KEYBOARD_AUTO_REPEAT_RATE_SLOW},
@@ skipping 1252 matching lines @@
 #endif
   AddUsersStrings(html_source);
   AddWebContentStrings(html_source);
 
   policy_indicator::AddLocalizedStrings(html_source);
 
   html_source->SetJsonPath(kLocalizedStringsFile);
 }
 
 }  // namespace settings