Add android:configChanges to the AndroidManifest.xml of testshell.

chrome/android/testshell/java/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <!-- 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.
  -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.chromium.chrome.testshell">
 
     <permission android:name="org.chromium.chrome.testshell.permission.SANDBOX"
             android:protectionLevel="signature" />
 
     <application android:name="org.chromium.chrome.testshell.ChromiumTestShellApplication"
             android:label="ChromiumTestShell">
         <activity android:name="org.chromium.chrome.testshell.ChromiumTestShellActivity"
                   android:label="ChromiumTestShellActivity"
                   android:launchMode="singleTask"
                   android:theme="@android:style/Theme.Holo.Light.NoActionBar"
+                  android:configChanges="orientation|keyboardHidden|keyboard|screenSize"
                   android:hardwareAccelerated="true">
               <intent-filter>
                   <action android:name="android.intent.action.MAIN" />
                   <category android:name="android.intent.category.LAUNCHER" />
               </intent-filter>
          </activity>
         <!-- The following service entries exist in order to allow us to
              start more than one sandboxed process. -->
 
         <!-- NOTE: If you change the values of "android:process" for any of the below services,
@@ skipping 30 matching lines @@
                  android:exported="false" />
     </application>
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="16" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.VIBRATE"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
 </manifest>