diff -r 000000000000 -r 6474c204b198 mobile/android/base/GeckoConnectivityReceiver.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/GeckoConnectivityReceiver.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,87 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.util.Log;
+
+public class GeckoConnectivityReceiver extends BroadcastReceiver {
+    /*
+     * Keep the below constants in sync with
+     * http://mxr.mozilla.org/mozilla-central/source/netwerk/base/public/nsINetworkLinkService.idl
+     */
+    private static final String LINK_DATA_UP = "up";
+    private static final String LINK_DATA_DOWN = "down";
+    private static final String LINK_DATA_UNKNOWN = "unknown";
+
+    private static final String LOGTAG = "GeckoConnectivityReceiver";
+
+    private static GeckoConnectivityReceiver sInstance = new GeckoConnectivityReceiver();
+
+    private final IntentFilter mFilter;
+    private Context mApplicationContext;
+    private boolean mIsEnabled;
+
+    public static GeckoConnectivityReceiver getInstance() {
+        return sInstance;
+    }
+
+    private GeckoConnectivityReceiver() {
+        mFilter = new IntentFilter();
+        mFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
+    }
+
+    public synchronized void start(Context context) {
+        if (mIsEnabled) {
+            Log.w(LOGTAG, "Already started!");
+            return;
+        }
+
+        mApplicationContext = context.getApplicationContext();
+
+        // registerReceiver will return null if registering fails.
+        if (mApplicationContext.registerReceiver(this, mFilter) == null) {
+            Log.e(LOGTAG, "Registering receiver failed");
+        } else {
+            mIsEnabled = true;
+        }
+    }
+
+    public synchronized void stop() {
+        if (!mIsEnabled) {
+            Log.w(LOGTAG, "Already stopped!");
+            return;
+        }
+
+        mApplicationContext.unregisterReceiver(this);
+        mApplicationContext = null;
+        mIsEnabled = false;
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo info = cm.getActiveNetworkInfo();
+
+        final String status;
+        if (info == null) {
+            status = LINK_DATA_UNKNOWN;
+        } else if (!info.isConnected()) {
+            status = LINK_DATA_DOWN;
+        } else {
+            status = LINK_DATA_UP;
+        }
+
+        if (GeckoThread.checkLaunchState(GeckoThread.LaunchState.GeckoRunning)) {
+            GeckoAppShell.sendEventToGecko(GeckoEvent.createNetworkLinkChangeEvent(status));
+        }
+    }
+}