Don't miss to call ContentView.onShow when lunching content shell and test shell

chrome/android/testshell/java/src/org/chromium/chrome/testshell/TabManager.java

 // Copyright 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.chrome.testshell;
 
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
@@ skipping 100 matching lines @@
             mContentViewHolder.removeView(mCurrentTab.getContentView());
             mCurrentTab.destroy();
         }
 
         mCurrentTab = tab;
 
         mToolbar.showTab(mCurrentTab);
         mContentViewHolder.addView(mCurrentTab.getContentView());
         mContentViewRenderView.setCurrentContentView(mCurrentTab.getContentView());
         mCurrentTab.getContentView().requestFocus();
+        mCurrentTab.getContentView().onShow();
     }
 }