Shortcut ctrl+shift+T added on android.

chrome/browser/ui/android/tab_model/tab_model_jni_bridge.cc

 // Copyright 2014 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/android/tab_model/tab_model_jni_bridge.h"
 
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 69 matching lines @@
   JNIEnv* env = AttachCurrentThread();
   return Java_TabModelJniBridge_index(env, java_object_.get(env).obj());
 }
 
 void TabModelJniBridge::CreateTab(TabAndroid* parent,
                                   WebContents* web_contents,
                                   int parent_tab_id) {
   JNIEnv* env = AttachCurrentThread();
   Java_TabModelJniBridge_createTabWithWebContents(
       env, java_object_.get(env).obj(),
-      parent->GetJavaObject().obj(),
+      (parent ? parent->GetJavaObject().obj() : NULL),

[David Trainor- moved to gerrit, 2016/07/14 18:25:53]

nullptr?  Or does that cause issues with the JNI method?

       web_contents->GetBrowserContext()->IsOffTheRecord(),
       web_contents->GetJavaWebContents().obj(),
       parent_tab_id);
 }
 
 WebContents* TabModelJniBridge::GetWebContentsAt(int index) const {
   TabAndroid* tab = GetTabAt(index);
   return tab == NULL ? NULL : tab->web_contents();
 }
 
@@ skipping 118 matching lines @@
 bool TabModelJniBridge::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 static jlong Init(JNIEnv* env,
                   const JavaParamRef<jobject>& obj,
                   jboolean is_incognito) {
   TabModel* tab_model = new TabModelJniBridge(env, obj, is_incognito);
   return reinterpret_cast<intptr_t>(tab_model);
 }