Implementation for switching between recently used tabs using ctrl tilde or quoteleft.

chrome/browser/ui/browser_command_controller.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/browser_command_controller.h"
 
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 543 matching lines @@
       break;
     case IDC_HELP_PAGE_VIA_MENU:
       ShowHelp(browser_, HELP_SOURCE_MENU);
       break;
     case IDC_SHOW_SYNC_SETUP:
       ShowSyncSetup(browser_, SyncPromoUI::SOURCE_MENU);
       break;
     case IDC_TOGGLE_SPEECH_INPUT:
       ToggleSpeechInput(browser_);
       break;
-
+    case IDC_SELECT_PREVIOUS_MRU_TAB:
+      SelectPreviousMRUTab(browser_);
+      break;
     default:
       LOG(WARNING) << "Received Unimplemented Command: " << id;
       break;
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserCommandController, content::NotificationObserver implementation:
 
 void BrowserCommandController::Observe(
@@ skipping 227 matching lines @@
   command_updater_.UpdateCommandEnabled(IDC_UPGRADE_DIALOG, true);
   command_updater_.UpdateCommandEnabled(IDC_VIEW_INCOMPATIBILITIES, true);
 
   // View Background Pages entry is always enabled, but is hidden if there are
   // no background pages.
   command_updater_.UpdateCommandEnabled(IDC_VIEW_BACKGROUND_PAGES, true);
 
   // Toggle speech input
   command_updater_.UpdateCommandEnabled(IDC_TOGGLE_SPEECH_INPUT, true);
 
+  // MRU Tab Controller
+  command_updater_.UpdateCommandEnabled(IDC_SELECT_PREVIOUS_MRU_TAB, true);
+
   // Initialize other commands whose state changes based on fullscreen mode.
   UpdateCommandsForFullscreenMode(FULLSCREEN_DISABLED);
 
   UpdateCommandsForContentRestrictionState();
 
   UpdateCommandsForBookmarkEditing();
 
   UpdateCommandsForIncognitoAvailability();
+
 }
 
 void BrowserCommandController::UpdateCommandsForIncognitoAvailability() {
   IncognitoModePrefs::Availability incognito_availability =
       IncognitoModePrefs::GetAvailability(profile()->GetPrefs());
   command_updater_.UpdateCommandEnabled(
       IDC_NEW_WINDOW,
       incognito_availability != IncognitoModePrefs::FORCED);
   command_updater_.UpdateCommandEnabled(
       IDC_NEW_INCOGNITO_WINDOW,
@@ skipping 236 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome