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

chrome/browser/ui/browser_commands.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_commands.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_editor.h"
@@ skipping 841 matching lines @@
 
 void OpenUpdateChromeDialog(Browser* browser) {
   content::RecordAction(UserMetricsAction("UpdateChrome"));
   browser->window()->ShowUpdateChromeDialog();
 }
 
 void ToggleSpeechInput(Browser* browser) {
   GetActiveWebContents(browser)->GetRenderViewHost()->ToggleSpeechInput();
 }
 
+void SelectPreviousMRUTab(Browser* browser) {
+  if (!browser->mru_tab_controller())
+    return;
+
+  TabContents* contents = browser->mru_tab_controller()->GetPreviousMRUTab();
+  if (contents)
+    ActivateTabAt(browser,
+                  browser->tab_strip_model()->GetIndexOfTabContents(contents),
+                  true);
+}
+
 void ToggleFullscreenMode(Browser* browser) {
   browser->fullscreen_controller()->ToggleFullscreenMode();
 }
 
 void ClearCache(Browser* browser) {
   BrowsingDataRemover* remover = new BrowsingDataRemover(browser->profile(),
       BrowsingDataRemover::EVERYTHING,
       base::Time());
   remover->Remove(BrowsingDataRemover::REMOVE_CACHE,
                   BrowsingDataHelper::UNPROTECTED_WEB);
@@ skipping 112 matching lines @@
   if (!tab_contents)
     tab_contents = new TabContents(contents);
   app_browser->tab_strip_model()->AppendTabContents(tab_contents, true);
 
   contents->GetMutableRendererPrefs()->can_accept_load_drops = false;
   contents->GetRenderViewHost()->SyncRendererPrefs();
   app_browser->window()->Show();
 }
 
 }  // namespace chrome