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

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index 5fdb3c1b97de9e3bb2beaad2219a969cb31eef07..24b0dc5056f9e72fd0530dc430708a82e495c7e8 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -859,6 +859,17 @@ 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();
 }