Create ContentShellActivityTestRule and BaseJUnitRunner

content/shell/android/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. -->
   <!-- package name must be unique so suffix with "tests" so package loader
        doesn't ignore this. -->
   <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.chromium.content_shell_apk.tests">
     <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="23" />
     <uses-permission android:name="android.permission.RUN_INSTRUMENTATION" />
     <!-- 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>
         <uses-library android:name="android.test.runner" />
         <activity android:name="org.chromium.test.broker.OnDeviceInstrumentationBroker"
             android:exported="true"/>
     </application>
+
+    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+        android:targetPackage="org.chromium.content_shell_apk"
+        android:label="Android JUnit 4 runner" />

[jbudorick, 2017/01/18 15:10:08]

This should be something like "JUnit4-based tests for
org.chromium.content_shell_apk"

[the real yoland, 2017/02/22 00:44:57]

Done

     <instrumentation android:name="org.chromium.base.test.BaseChromiumInstrumentationTestRunner"
         android:targetPackage="org.chromium.content_shell_apk"
         android:label="Tests for org.chromium.content_shell_apk"/>
 </manifest>