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..c3203f4c541701a1bec3738c7e771c1ce16fa17c 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();
     }
 
@@ -720,8 +723,11 @@ public class TabModelImpl extends TabModelJniBridge {
     @Override
     protected boolean createTabWithWebContents(Tab parent, boolean incognito,
             WebContents webContents, int parentId) {
+        // TODO(xingliu): figure out if TabLaunchType.FROM_LONGPRESS_FOREGROUND affects
+        // other features. FROM_LONGPRESS_FOREGROUND makes tab restored in foreground when called
+        // from native code.
         return getTabCreator(incognito).createTabWithWebContents(parent, webContents, parentId,
-                TabLaunchType.FROM_LONGPRESS_BACKGROUND);
+                TabLaunchType.FROM_LONGPRESS_FOREGROUND);
     }
 
     @Override
@@ -738,4 +744,23 @@ public class TabModelImpl extends TabModelJniBridge {
     protected boolean isSessionRestoreInProgress() {
         return mModelDelegate.isSessionRestoreInProgress();
     }
+
+    /**
+     * Opens the most recently closed tab, bringing the tab back into this model.
+     * If no tabs are currently in the rewound list, restore the tab from tab restore service.

[Theresa, 2016/06/30 20:50:24]

Generally we don't add JavaDocs for overridden methods. The inline methods below
explain what the code is doing.

[xingliu, 2016/07/01 00:30:38]

Done.

+     */
+    @Override
+    public void openRecentlyClosedTab() {
+        // 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 tab restore service in native code.

[Theresa, 2016/06/30 20:50:24]

nit: "..from the native tab restore service."

[xingliu, 2016/07/01 00:30:38]

Done.

+        mRecentlyClosedBridge.openRecentlyClosedTab();
+    }
 }