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

content/browser/android/background_sync_network_observer_android.cc

+// 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.
+
+#include "content/browser/android/background_sync_network_observer_android.h"
+
+#include "content/public/browser/browser_thread.h"
+#include "jni/BackgroundSyncNetworkObserver_jni.h"
+
+namespace content {
+
+// static
+bool BackgroundSyncNetworkObserverAndroid::RegisterNetworkObserver(
+    JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+BackgroundSyncNetworkObserverAndroid::BackgroundSyncNetworkObserverAndroid(
+    const base::Closure& network_changed_callback)
+  : BackgroundSyncNetworkObserver(network_changed_callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  // Remove the observer attached by the NetworkObserver constructor
+  net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
+
+  // Attach a Java BackgroundSyncNetworkObserver object. Its lifetime will be
+  // scoped to the lifetime of this object.
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jobject> obj =
+      Java_BackgroundSyncNetworkObserver_createObserver(
+          env, base::android::GetApplicationContext(),
+          reinterpret_cast<jlong>(this));
+  observer_ = obj;
+}
+
+BackgroundSyncNetworkObserverAndroid::~BackgroundSyncNetworkObserverAndroid() {

[jkarlin, 2015/08/28 01:19:48]

Since this is empty, prefer = default in the header file.

[iclelland, 2015/08/31 16:00:52]

Done.

+}
+
+void BackgroundSyncNetworkObserverAndroid::NotifyConnectionTypeChanged(
+    JNIEnv* env,
+    jobject jcaller,
+    jint new_connection_type) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  OnNetworkChanged(static_cast<net::NetworkChangeNotifier::ConnectionType>(
+      new_connection_type));
+}
+
+}  // namespace content