Create AwJUnit4ClassRunner AwActivityTestRule and convert AwContentsTest

android_webview/javatests/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.android_webview.test">
     <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="23" />
     <instrumentation android:name="org.chromium.android_webview.test.AwInstrumentationTestRunner"
         android:targetPackage="org.chromium.android_webview.shell"
         android:label="Tests for org.chromium.android_webview"/>
+    <instrumentation android:name="org.chromium.base.test.BaseChromiumAndroidJUnitRunner"
+        android:targetPackage="org.chromium.android_webview.shell"
+        chromium-junit4="true"
+        android:label="Tests for org.chromium.android_webview"/>
     <uses-permission android:name="android.permission.RUN_INSTRUMENTATION" />
     <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
     <uses-permission android:name="android.permission.READ_LOGS"/>
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <!-- We add an application tag here just so that we can indicate that this
          package needs to link against the android.test library, which is
          needed when building test cases. -->
     <application android:hardwareAccelerated="false">
         <uses-library android:name="android.test.runner" />
         <activity android:name="org.chromium.test.broker.OnDeviceInstrumentationBroker"
             android:exported="true"/>
     </application>
 </manifest>