Make content shell on android support relaunching.

content/shell/android/java/src/org/chromium/content_shell/ShellManager.java

 // Copyright (c) 2012 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.content_shell;
 
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.widget.FrameLayout;
@@ skipping 17 matching lines @@
         nativeInit(this);
     }
 
     /**
      * @return The currently visible shell view or null if one is not showing.
      */
     protected Shell getActiveShell() {
         return mActiveShell;
     }
 
+    /**
+     * Creates a new shell pointing to the specified URL.
+     * @param url The URL the shell should load upon creation.
+     */
+    public void launchShell(String url) {
+        nativeLaunchShell(url);
+    }
+
     @SuppressWarnings("unused")
     @CalledByNative
     private Object createShell() {
         LayoutInflater inflater =
                 (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         Shell shellView = (Shell) inflater.inflate(R.layout.shell_view, null);
 
         removeAllViews();
         addView(shellView, new FrameLayout.LayoutParams(
                 FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
         mActiveShell = shellView;
 
         return shellView;
     }
 
     private static native void nativeInit(Object shellManagerInstance);
+    private static native void nativeLaunchShell(String url);
 }