Opening new "about:blank" tab if all tabs are closed in tab switcher mode.

chrome/android/javatests/src/org/chromium/chrome/browser/test/ModalDialogTest.java

 // Copyright 2013 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.
 
 package org.chromium.chrome.browser.test;
 
 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.test.suitebuilder.annotation.MediumTest;
 import android.util.Log;
@@ skipping 265 matching lines @@
      * is closed.
      */
     @MediumTest
     @Feature({"Browser", "Main"})
     public void testDialogDismissedAfterClosingTab() throws InterruptedException {
         executeJavaScriptAndWaitForDialog("alert('Android')");
 
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
-                getActivity().closeAllTabs();
+                getActivity().closeTab();
             }
         });
 
         // Closing the tab should have dismissed the dialog.
         boolean criteriaSatisfied = CriteriaHelper.pollForCriteria(
                 new JavascriptAppModalDialogShownCriteria(false));
         assertTrue("The dialog should have been dismissed when its tab was closed.",
                 criteriaSatisfied);
     }
 
@@ skipping 111 matching lines @@
                 button.getVisibility());
         assertEquals("'" + readableName + "' button has wrong text",
                 getActivity().getResources().getString(expectedTextResourceId),
                 button.getText().toString());
     }
 
     private TestCallbackHelperContainer getActiveTabTestCallbackHelperContainer() {
         return new TestCallbackHelperContainer(getActivity().getActiveTab().getContentViewCore());
     }
 }