Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/preferences/ConnectionChangeReceiver.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.chrome.browser.preferences;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.ConnectivityManager;
+
+import org.chromium.chrome.browser.precache.PrecacheLauncher;
+import org.chromium.chrome.browser.preferences.privacy.PrivacyPreferencesManager;
+
+/**
+ * When there is a change in the network connection,this will update the sharedpref value whether
+ * to allow prefetch or not.
+ */
+public class ConnectionChangeReceiver extends BroadcastReceiver {
+
+    private boolean mIsRegistered;
+
+    public void registerReceiver(Context context) {
+        mIsRegistered = true;
+        IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
+        context.registerReceiver(this, filter);
+    }
+
+    public void unregisterReceiver(Context context) {
+        mIsRegistered = false;
+        context.unregisterReceiver(this);
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // Only handle the action if we're currently registered. If we're not registered as a
+        // listener, then we might be paused and native may not be loaded which would crash.
+        if (mIsRegistered) {
+            PrecacheLauncher.updatePrecachingEnabled(
+                    PrivacyPreferencesManager.getInstance(context),
+                    context.getApplicationContext());
+        }
+    }
+}