Provide abstraction for ManagerAdaptorInterface

D-Bus implementation of the interface is also included.

Bug: 24194427
TEST=Build apmanager for both Brillo and Chrome OS

Change-Id: Id2478673cbca36279fb9e5e87a203a4eb021d1db
diff --git a/manager_adaptor_interface.h b/manager_adaptor_interface.h
new file mode 100644
index 0000000..00826e0
--- /dev/null
+++ b/manager_adaptor_interface.h
@@ -0,0 +1,34 @@
+//
+// Copyright 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef APMANAGER_MANAGER_ADAPTOR_INTERFACE_H_
+#define APMANAGER_MANAGER_ADAPTOR_INTERFACE_H_
+
+#include <base/callback.h>
+
+namespace apmanager {
+
+class ManagerAdaptorInterface {
+ public:
+  virtual ~ManagerAdaptorInterface() {}
+
+  virtual void RegisterAsync(
+      const base::Callback<void(bool)>& completion_callback) = 0;
+};
+
+}  // namespace apmanager
+
+#endif  // APMANAGER_MANAGER_ADAPTOR_INTERFACE_H_