Chrome Performance Monitor: Metric API Functions.

chrome/browser/performance_monitor/metric_details.cc

Index: chrome/browser/performance_monitor/metric_details.cc
diff --git a/chrome/browser/performance_monitor/metric_details.cc b/chrome/browser/performance_monitor/metric_details.cc
index e16e1deef3361fef3ef0ee02b60073236291c76a..b8754ed6530e13af90aeadc144ebfc03496eacb0 100644
--- a/chrome/browser/performance_monitor/metric_details.cc
+++ b/chrome/browser/performance_monitor/metric_details.cc
@@ -4,7 +4,26 @@
 
 #include "chrome/browser/performance_monitor/metric_details.h"
 
+#include "base/logging.h"
+#include "chrome/browser/performance_monitor/constants.h"
+
 namespace performance_monitor {
+namespace {
+
+// Keep this array synced with MetricTypes in the header file.
+// TODO(mtytel): i18n.
+const char* kMetricTypeNames[] = {
+  kSampleMetricName
+};
+COMPILE_ASSERT(ARRAYSIZE_UNSAFE(kMetricTypeNames) == METRIC_NUMBER_OF_METRICS,
+               metric_names_incorrect_size);
+
+}  // namespace
+
+const char* MetricTypeToString(MetricType metric_type) {
+  DCHECK_GT(METRIC_NUMBER_OF_METRICS, metric_type);
+  return kMetricTypeNames[metric_type];
+}
 
 MetricDetails::MetricDetails() {
 }