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

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index f2d7be66c2f743a0000fe8fcb34a4d9e7dabd32e..d61745ccc1514db02ba4afec85fbd366a48cfc30 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -561,7 +561,9 @@ void BrowserCommandController::ExecuteCommandWithDisposition(
     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;
@@ -809,6 +811,9 @@ void BrowserCommandController::InitCommandState() {
   // 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);
 
@@ -817,6 +822,7 @@ void BrowserCommandController::InitCommandState() {
   UpdateCommandsForBookmarkEditing();
 
   UpdateCommandsForIncognitoAvailability();
+
 }
 
 void BrowserCommandController::UpdateCommandsForIncognitoAvailability() {