odrefresh: Add support for uploading stats

Adds support for loading odrefresh metrics saved to file and uploading
them when system_server starts.

Bug: 169925964
Test: manual module update with instrumentation showing statsd got data
Change-Id: Iccc6ede1583235d09dbfd42996eb4ba118b700f8
diff --git a/odrefresh/odr_statslog_host.cc b/odrefresh/odr_statslog_host.cc
new file mode 100644
index 0000000..118563a
--- /dev/null
+++ b/odrefresh/odr_statslog_host.cc
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2021 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 "odr_statslog/odr_statslog.h"  // for declararation of UploadStatsIfAvailable().
+
+#include <iosfwd>                       // for forward declaration of std::string.
+namespace art {
+namespace odrefresh {
+
+bool UploadStatsIfAvailable(/*out*/std::string* /*error_msg*/) {
+  // No stats reported from host, report success.
+  return true;
+}
+
+}  // namespace odrefresh
+}  // namespace art