[Android] Introduce RegistrationPolicy for NetworkChangeNotifier.

content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java

 // Copyright 2015 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.content.browser;
 
 import android.Manifest;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.os.Process;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.NativeClassQualifiedName;
 import org.chromium.net.NetworkChangeNotifierAutoDetect;
+import org.chromium.net.RegistrationPolicyAlwaysRegister;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
  * Contains the Java code used by the BackgroundSyncNetworkObserverAndroid C++ class.
  *
  * The purpose of this class is to listen for and forward network connectivity events to the
  * BackgroundSyncNetworkObserverAndroid objects even when the application is paused. The standard
  * NetworkChangeNotifier does not listen for connectivity events when the application is paused.
@@ skipping 39 matching lines @@
     }
 
     private void registerObserver(final long nativePtr) {
         ThreadUtils.assertOnUiThread();
         if (!canCreateObserver(mContext)) {
             return;
         }
 
         // Create the NetworkChangeNotifierAutoDetect if it does not exist already.
         if (mNotifier == null) {
-            mNotifier =
-                    new NetworkChangeNotifierAutoDetect(this, mContext, true /* always listen */);
+            mNotifier = new NetworkChangeNotifierAutoDetect(this, mContext,
+                                new RegistrationPolicyAlwaysRegister());
         }
         mNativePtrs.add(nativePtr);
 
         nativeNotifyConnectionTypeChanged(
                 nativePtr, mNotifier.getCurrentConnectionType(mNotifier.getCurrentNetworkState()));
     }
 
     @CalledByNative
     private void removeObserver(long nativePtr) {
         ThreadUtils.assertOnUiThread();
@@ skipping 20 matching lines @@
     @Override
     public void onNetworkSoonToDisconnect(int netId) {}
     @Override
     public void onNetworkDisconnect(int netId) {}
     @Override
     public void updateActiveNetworkList(int[] activeNetIds) {}
 
     @NativeClassQualifiedName("BackgroundSyncNetworkObserverAndroid::Observer")
     private native void nativeNotifyConnectionTypeChanged(long nativePtr, int newConnectionType);
 }