Compile apmanager on Android

Noticeable changes to get apmanager to compile on Android:
- Conditional include headers for D-Bus service constants
  based on the target platform.
- Use firewalld proxy instead of permission_broker proxy on
  Android.
- Use stub shill proxy instead of the real one until libshill-client
  is ready.

Bug: 24164800
TEST=Compile apmanager on both Android and Chrome OS
TEST=Run apmanager on Chrome OS device

Change-Id: I7885323796e0043a1e3cc46c129e2736faf4fced
diff --git a/run_all_tests.cc b/run_all_tests.cc
new file mode 100644
index 0000000..243bc95
--- /dev/null
+++ b/run_all_tests.cc
@@ -0,0 +1,21 @@
+//
+// Copyright (C) 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.
+
+#include <gtest/gtest.h>
+
+int main(int argc, char **argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}