[Sync] Turn notifier::PushClient into an interface

jingle/notifier/listener/fake_push_client_observer.cc

Index: jingle/notifier/listener/fake_push_client_observer.cc
diff --git a/jingle/notifier/listener/fake_push_client_observer.cc b/jingle/notifier/listener/fake_push_client_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ec1b9e1118802faeacefdb6abb4f1bbe63044129
--- /dev/null
+++ b/jingle/notifier/listener/fake_push_client_observer.cc
@@ -0,0 +1,34 @@
+// Copyright (c) 2012 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 "jingle/notifier/listener/fake_push_client_observer.h"
+
+namespace notifier {
+
+FakePushClientObserver::FakePushClientObserver()
+    : notifications_enabled_(false) {}
+
+FakePushClientObserver::~FakePushClientObserver() {}
+
+void FakePushClientObserver::OnNotificationStateChange(
+    bool notifications_enabled) {
+  notifications_enabled_ = notifications_enabled;
+}
+
+void FakePushClientObserver::OnIncomingNotification(
+    const Notification& notification) {
+  last_incoming_notification_ = notification;
+}
+
+bool FakePushClientObserver::notifications_enabled() const {
+  return notifications_enabled_;
+}
+
+const Notification&
+FakePushClientObserver::last_incoming_notification() const {
+  return last_incoming_notification_;
+}
+
+}  // namespace notifier
+