Add Cronet Test App that uses libcronet_tests.so with net test utilities.

components/cronet/android/test/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <!-- Copyright 2014 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.cronet_sample_apk">
+    package="org.chromium.cronet_test_apk">
 
-    <application android:name="CronetSampleApplication"
-            android:label="Cronet Sample">
-        <activity android:name="CronetSampleActivity"
+    <application android:name="CronetTestApplication"
+            android:label="Cronet Test">
+        <activity android:name="CronetTestActivity"
                   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>
     </application>
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="20" />
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 </manifest>