Fix sensor uuid, retrofit recent event logger

Fix an issue that causes uuid field not being initialzed in
sensorservice.

MostRecentEventLogger in sensorservice is migrated to use RingBuffer
instead of a custom circular buffer. This is expected to improve
readability and maintainability of code.

Dumpsys print format is retouched to offer more information in easier
to read format.

Bug: 28305085

Change-Id: I190e43350b60a22a9fccb92a95d6eab06a471560
diff --git a/services/sensorservice/SensorServiceUtils.h b/services/sensorservice/SensorServiceUtils.h
new file mode 100644
index 0000000..1558feb
--- /dev/null
+++ b/services/sensorservice/SensorServiceUtils.h
@@ -0,0 +1,38 @@
+/*
+ * 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 ANDROID_SENSOR_SERVICE_UTIL
+#define ANDROID_SENSOR_SERVICE_UTIL
+
+#include <cstddef>
+#include <string>
+
+namespace android {
+namespace SensorServiceUtil {
+
+class Dumpable {
+public:
+    virtual std::string dump() const = 0;
+    virtual void setFormat(std::string ) {}
+    virtual ~Dumpable() {}
+};
+
+size_t eventSizeBySensorType(int type);
+
+} // namespace SensorServiceUtil
+} // namespace android;
+
+#endif // ANDROID_SENSOR_SERVICE_UTIL