Add support for robolectric play-services-shadows.

chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/BackgroundSchedulerTest.java

 // Copyright 2016 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.browser.offlinepages;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import android.content.Context;
 
+import com.google.android.gms.common.ConnectionResult;
+import com.google.android.gms.common.GoogleApiAvailability;
 import com.google.android.gms.gcm.GcmNetworkManager;
 import com.google.android.gms.gcm.Task;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 import org.robolectric.internal.ShadowExtractor;
+import org.robolectric.shadows.gms.Shadows;
+import org.robolectric.shadows.gms.common.ShadowGoogleApiAvailability;
 
 import org.chromium.base.BaseChromiumApplication;
 import org.chromium.base.test.util.Feature;
 import org.chromium.testing.local.LocalRobolectricTestRunner;
 
 /**
  * Unit tests for BackgroundScheduler.
  */
 @RunWith(LocalRobolectricTestRunner.class)
 @Config(manifest = Config.NONE, application = BaseChromiumApplication.class, sdk = 21,
         shadows = {ShadowGcmNetworkManager.class, ShadowGoogleApiAvailability.class})
 public class BackgroundSchedulerTest {
     private Context mContext;
     private TriggerConditions mConditions1 = new TriggerConditions(
             true /* power */, 10 /* battery percentage */, false /* unmetered */);
     private ShadowGcmNetworkManager mGcmNetworkManager;
 
     @Before
     public void setUp() throws Exception {
+        Shadows.shadowOf(GoogleApiAvailability.getInstance())
+                .setIsGooglePlayServicesAvailable(ConnectionResult.SUCCESS);
+
         mContext = RuntimeEnvironment.application;
         mGcmNetworkManager = (ShadowGcmNetworkManager) ShadowExtractor.extract(
                 GcmNetworkManager.getInstance(mContext));
         mGcmNetworkManager.clear();
     }
 
     @Test
     @Feature({"OfflinePages"})
     public void testSchedule() {
         assertNull(mGcmNetworkManager.getScheduledTask());
@@ skipping 15 matching lines @@
     public void testCancel() {
         assertNull(mGcmNetworkManager.getScheduledTask());
         BackgroundScheduler.getInstance(mContext).schedule(mConditions1);
         assertNotNull(mGcmNetworkManager.getScheduledTask());
 
         assertNull(mGcmNetworkManager.getCanceledTask());
         BackgroundScheduler.getInstance(mContext).cancel();
         assertNotNull(mGcmNetworkManager.getCanceledTask());
     }
 }