Fix keyboard overlay when the Search key is mapped to Backspace

chrome/browser/ui/webui/chromeos/keyboard_overlay_ui.cc

 // Copyright (c) 2012 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/chromeos/keyboard_overlay_ui.h"
 
 #include <stddef.h>
 
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
@@ skipping 38 matching lines @@
 struct ModifierToLabel {
   const ModifierKey modifier;
   const char* label;
 } kModifierToLabels[] = {
   {chromeos::input_method::kSearchKey, "search"},
   {chromeos::input_method::kControlKey, "ctrl"},
   {chromeos::input_method::kAltKey, "alt"},
   {chromeos::input_method::kVoidKey, "disabled"},
   {chromeos::input_method::kCapsLockKey, "caps lock"},
   {chromeos::input_method::kEscapeKey, "esc"},
+  {chromeos::input_method::kBackspaceKey, "backspace"},
 };
 
 struct I18nContentToMessage {
   const char* i18n_content;
   int message;
 } kI18nContentToMessage[] = {
   { "keyboardOverlayLearnMore", IDS_KEYBOARD_OVERLAY_LEARN_MORE },
   { "keyboardOverlayTitle", IDS_KEYBOARD_OVERLAY_TITLE },
   { "keyboardOverlayEscKeyLabel", IDS_KEYBOARD_OVERLAY_ESC_KEY_LABEL },
   { "keyboardOverlayBackKeyLabel", IDS_KEYBOARD_OVERLAY_BACK_KEY_LABEL },
@@ skipping 348 matching lines @@
 KeyboardOverlayUI::KeyboardOverlayUI(content::WebUI* web_ui)
     : WebDialogUI(web_ui) {
   Profile* profile = Profile::FromWebUI(web_ui);
   KeyboardOverlayHandler* handler = new KeyboardOverlayHandler(profile);
   web_ui->AddMessageHandler(handler);
 
   // Set up the chrome://keyboardoverlay/ source.
   content::WebUIDataSource::Add(profile,
                                 CreateKeyboardOverlayUIHTMLSource(profile));
 }