Add statsd.

It doesn't start yet by default. When you start it manually, it sets
itself up as a binder system service and starts a thread to read the
event log.

Test: Run statsd, observe output. also run stats_test
Change-Id: If435d6a80fef3c1d957aedb61699bf5e9aae7e56
diff --git a/cmds/statsd/src/StatsService.h b/cmds/statsd/src/StatsService.h
new file mode 100644
index 0000000..0f34882
--- /dev/null
+++ b/cmds/statsd/src/StatsService.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2016 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 STATS_SERVICE_H
+#define STATS_SERVICE_H
+
+#include <android/os/BnStatsManager.h>
+#include <utils/Looper.h>
+
+#include <deque>
+#include <mutex>
+
+using namespace android;
+using namespace android::base;
+using namespace android::binder;
+using namespace android::os;
+using namespace std;
+
+
+// ================================================================================
+class StatsService : public BnStatsManager {
+public:
+    StatsService(const sp<Looper>& handlerLooper);
+    virtual ~StatsService();
+
+    virtual status_t dump(int fd, const Vector<String16>& args);
+    virtual Status systemRunning();
+
+};
+
+#endif // STATS_SERVICE_H