Updated copyright notice and cleaned up includes.

[ Merge of http://go/wvgerrit/137810 ]

Bug: 204946540
Test: Metric unit tests
Change-Id: I78f839fafd27604a2bb78c04d587c40919c5372d

libwvdrmengine/cdm/metrics/src/timer_metric.cpp

@@ -1,8 +1,10 @@
+// Copyright 2017 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
 #include "timer_metric.h"
 
 namespace wvcdm {
 namespace metrics {
-
 void TimerMetric::Start() {
   start_ = clock_.now();
   is_started_ = true;
@@ -17,6 +19,5 @@ double TimerMetric::AsMs() const {
 double TimerMetric::AsUs() const {
   return (clock_.now() - start_) / std::chrono::microseconds(1);
 }
-
 }  // namespace metrics
 }  // namespace wvcdm