[BackgroundSync] Trigger Background Sync events when Chrome is backgrounded on Android

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

Index: content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java b/content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java
new file mode 100644
index 0000000000000000000000000000000000000000..1c60f448f9df61e7e4fce8b28b1808c030f74558
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java
@@ -0,0 +1,50 @@
+// 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.content.Context;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.base.annotations.NativeClassQualifiedName;
+import org.chromium.net.NetworkChangeNotifierAutoDetect;
+
+/**
+ * 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 even when the application is paused. The standard
+ * NetworkChangeNotifier does not listen for connectivity events when the application is paused.
+ */
+@JNINamespace("content")
+public class BackgroundSyncNetworkObserver implements NetworkChangeNotifierAutoDetect.Observer {
+
+    private NetworkChangeNotifierAutoDetect mNotifier;
+    private long mNativePtr;
+
+    public BackgroundSyncNetworkObserver(Context ctx, long nativePtr) {
+        mNotifier = new NetworkChangeNotifierAutoDetect(this, ctx, true);
+        mNativePtr = nativePtr;
+        onConnectionTypeChanged(mNotifier.getCurrentConnectionType(
+                mNotifier.getCurrentNetworkState()));
+    }
+
+    @CalledByNative
+    public static BackgroundSyncNetworkObserver createObserver(Context ctx, long nativePtr) {
+        return new BackgroundSyncNetworkObserver(ctx, nativePtr);
+    }
+
+    @Override
+    public void onConnectionTypeChanged(int newConnectionType) {
+        nativeNotifyConnectionTypeChanged(mNativePtr, newConnectionType);
+    }
+
+    @Override
+    public void onMaxBandwidthChanged(double maxBandwidthMbps) {
+    }
+
+    @NativeClassQualifiedName("BackgroundSyncNetworkObserverAndroid")
+    private native void nativeNotifyConnectionTypeChanged(long nativePtr, int newConnectionType);
+}