Add update_verifier for A/B OTA update.

update_verifier checks the integrity of the updated system and vendor
partitions on the first boot post an A/B OTA update. It marks the
current slot as having booted successfully if it passes the verification.

This CL doesn't perform any actual verification work which will be
addressed in follow-up CLs.

Bug: 26039641
Change-Id: Ia5504ed25b799b48b5886c2fc68073a360127f42
diff --git a/update_verifier/Android.mk b/update_verifier/Android.mk
new file mode 100644
index 0000000..0bb0547
--- /dev/null
+++ b/update_verifier/Android.mk
@@ -0,0 +1,24 @@
+# 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.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_CLANG := true
+LOCAL_SRC_FILES := update_verifier.cpp
+LOCAL_MODULE := update_verifier
+LOCAL_SHARED_LIBRARIES := libcutils libhardware
+
+include $(BUILD_EXECUTABLE)