Shortcut ctrl+shift+T added on android.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
index dced692244dd1757add5f1599c5bad8b8c3b3f09..7fd9197c638e2787d9c5845a6418179354709bd9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
@@ -148,6 +148,11 @@ public interface TabModel extends TabList {
     public void cancelTabClosure(int tabId);
 
     /**
+     * Opens the most recently closed tab, bringing the tab back into this model.

[Theresa, 2016/07/12 00:06:16]

nit: since this can technically bring it back into a different tab model, we
should reword this as "... the tab back into its original model or this model if
the original model no longer exists."

+     */
+    public void openMostRecentlyClosedTab();
+
+    /**
      * @return The complete {@link TabList} this {@link TabModel} represents.  Note that this may
      *         be different than this actual {@link TabModel} if it supports pending closures
      *         {@link #supportsPendingClosures()}, as this will include all pending closure tabs.