Enable to show the keyboard overlay by shortcut key.

chrome/browser/ui/browser.cc

 // Copyright (c) 2010 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/browser.h"
 
 #if defined(OS_WIN)
 #include <shellapi.h>
 #include <windows.h>
 #endif  // OS_WIN
@@ skipping 1443 matching lines @@
     // visible at this point. Wait for next event cycle which toggles
     // the visibility of omnibox before creating new tab.
     MessageLoop::current()->PostTask(
         FROM_HERE, method_factory_.NewRunnableMethod(&Browser::Search));
     return;
   }
 
   // Otherwise just open it.
   NewTab();
 }
+
+void Browser::ShowKeyboardOverlay() {
+  window_->ShowKeyboardOverlay(window_->GetNativeHandle());
+}
 #endif
 
 void Browser::Exit() {
   UserMetrics::RecordAction(UserMetricsAction("Exit"), profile_);
 #if defined(OS_CHROMEOS)
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutStarted", false);
   // Write /tmp/uptime-logout-started as well.
   const char kLogoutStarted[] = "logout-started";
   chromeos::BootTimesLoader::Get()->RecordCurrentStats(kLogoutStarted);
 
@@ skipping 648 matching lines @@
     case IDC_SELECT_LAST_TAB:       SelectLastTab();                  break;
     case IDC_DUPLICATE_TAB:         DuplicateTab();                   break;
     case IDC_RESTORE_TAB:           RestoreTab();                     break;
     case IDC_COPY_URL:              WriteCurrentURLToClipboard();     break;
     case IDC_SHOW_AS_TAB:           ConvertPopupToTabbedBrowser();    break;
     case IDC_FULLSCREEN:            ToggleFullscreenMode();           break;
     case IDC_EXIT:                  Exit();                           break;
     case IDC_TOGGLE_VERTICAL_TABS:  ToggleUseVerticalTabs();          break;
 #if defined(OS_CHROMEOS)
     case IDC_SEARCH:                Search();                         break;
+    case IDC_SHOW_KEYBOARD_OVERLAY: ShowKeyboardOverlay();            break;
 #endif
 
     // Page-related commands
     case IDC_SAVE_PAGE:             SavePage();                       break;
     case IDC_BOOKMARK_PAGE:         BookmarkCurrentPage();            break;
     case IDC_BOOKMARK_ALL_TABS:     BookmarkAllTabs();                break;
     case IDC_VIEW_SOURCE:           ViewSource();                     break;
     case IDC_EMAIL_PAGE_LOCATION:   EmailPageLocation();              break;
     case IDC_PRINT:                 Print();                          break;
     case IDC_ENCODING_AUTO_DETECT:  ToggleEncodingAutoDetect();       break;
@@ skipping 1320 matching lines @@
   command_updater_.UpdateCommandEnabled(IDC_TASK_MANAGER, true);
   command_updater_.UpdateCommandEnabled(IDC_SHOW_HISTORY, true);
   command_updater_.UpdateCommandEnabled(IDC_SHOW_BOOKMARK_MANAGER,
                                         browser_defaults::bookmarks_enabled);
   command_updater_.UpdateCommandEnabled(IDC_SHOW_DOWNLOADS, true);
   command_updater_.UpdateCommandEnabled(IDC_HELP_PAGE, true);
   command_updater_.UpdateCommandEnabled(IDC_IMPORT_SETTINGS, true);
 
 #if defined(OS_CHROMEOS)
   command_updater_.UpdateCommandEnabled(IDC_SEARCH, true);
+  command_updater_.UpdateCommandEnabled(IDC_SHOW_KEYBOARD_OVERLAY, true);
   command_updater_.UpdateCommandEnabled(IDC_SYSTEM_OPTIONS, true);
   command_updater_.UpdateCommandEnabled(IDC_INTERNET_OPTIONS, true);
 #endif
 
   ExtensionsService* extensions_service = profile()->GetExtensionsService();
   bool enable_extensions =
       extensions_service && extensions_service->extensions_enabled();
   command_updater_.UpdateCommandEnabled(IDC_MANAGE_EXTENSIONS,
                                         enable_extensions);
 
@@ skipping 654 matching lines @@
   NOTREACHED();
   return false;
 }
 
 void Browser::CreateInstantIfNecessary() {
   if (type() == TYPE_NORMAL && InstantController::IsEnabled(profile()) &&
       !profile()->IsOffTheRecord()) {
     instant_.reset(new InstantController(profile_, this));
   }
 }