Widevine Metrics System

This change is the complete Widevine metrics system. It will
measure and record runtime information about what is happening
in the CDM - such as errors and throughput.

Bug: 33745339
Bug: 26027857
Change-Id: Ic9a82074f1e2b72c72d751b235f8ae361232787d

libwvdrmengine/cdm/metrics/include/report.h

@@ -0,0 +1,29 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+
+#ifndef WVCDM_METRICS_REPORT_H_
+#define WVCDM_METRICS_REPORT_H_
+
+#include <stdint.h>
+
+#include "event_metric.h"
+
+namespace wvcdm {
+namespace metrics {
+
+class Report : public MetricNotification {
+
+ public:
+
+  virtual ~Report() { }
+
+  /* Create a new report of the same type. The new report is not
+   * a copy of this report. The pointer is to be owned by whoever
+   * calls this function. */
+  virtual Report* NewReport() const;
+
+};
+
+} // metrics
+} //wvcdm
+
+#endif