Shortcut ctrl+shift+T added on android.

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelImpl.java
index 85f5a65bc85bf78cee4009a29482dec305e01974..99cc2ef2b9d07225a76b32a01c99aaee7b7471f4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelImpl.java
@@ -9,6 +9,7 @@ import org.chromium.base.ObserverList;
 import org.chromium.base.TraceEvent;
 import org.chromium.chrome.browser.ChromeTabbedActivity;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.ntp.RecentlyClosedBridge;
 import org.chromium.chrome.browser.partnercustomizations.HomepageManager;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.TabCreatorManager.TabCreator;
@@ -45,6 +46,7 @@ public class TabModelImpl extends TabModelJniBridge {
     private final TabPersistentStore mTabSaver;
     private final TabModelDelegate mModelDelegate;
     private final ObserverList<TabModelObserver> mObservers;
+    private RecentlyClosedBridge mRecentlyClosedBridge;
 
     // Undo State Tracking -------------------------------------------------------------------------
 
@@ -81,6 +83,7 @@ public class TabModelImpl extends TabModelJniBridge {
         mModelDelegate = modelDelegate;
         mIsUndoSupported = supportUndo;
         mObservers = new ObserverList<TabModelObserver>();
+        mRecentlyClosedBridge = new RecentlyClosedBridge(getProfile());
     }
 
     @Override
@@ -99,7 +102,7 @@ public class TabModelImpl extends TabModelJniBridge {
         mRewoundList.destroy();
         mTabs.clear();
         mObservers.clear();
-
+        mRecentlyClosedBridge.destroy();
         super.destroy();
     }
 
@@ -738,4 +741,21 @@ public class TabModelImpl extends TabModelJniBridge {
     protected boolean isSessionRestoreInProgress() {
         return mModelDelegate.isSessionRestoreInProgress();
     }
+
+    @Override
+    public void openMostRecentlyClosedTab() {
+        // First try to recover tab from rewound list, same as {@link UndoBarController}.
+        if (mRewoundList.hasPendingClosures()) {
+            Tab tab = mRewoundList.getNextRewindableTab();
+            if (tab == null) return;
+            cancelTabClosure(tab.getId());
+            return;
+        }
+
+        // If there are no pending closures in the rewound list,
+        // then try to restore the tab from the native tab restore service.
+        mRecentlyClosedBridge.openRecentlyClosedTab();
+        // If there is only one tab, select it.
+        if (getCount() == 1) setIndex(0, TabSelectionType.FROM_NEW);
+    }
 }