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base/metrics/histogram_macros.h

Index: base/metrics/histogram_macros.h
diff --git a/base/metrics/histogram_macros.h b/base/metrics/histogram_macros.h
index dcde7255c8dafee8e28c09e21baf492408ea8682..d3a16eb6cbb1979b0efa7bf4280fd465e37809b0 100644
--- a/base/metrics/histogram_macros.h
+++ b/base/metrics/histogram_macros.h
@@ -8,6 +8,7 @@
 #include "base/atomicops.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/template_util.h"
 #include "base/time/time.h"
 
 // Macros for efficient use of histograms. See documentation in histogram.h.
@@ -149,9 +150,11 @@
 // values >= boundary_value so that mistakes in calling the UMA enumeration
 // macros can be detected.
 #define HISTOGRAM_ENUMERATION_WITH_FLAG(name, sample, boundary, flag) \
-    STATIC_HISTOGRAM_POINTER_BLOCK(name, Add(sample), \
-        base::LinearHistogram::FactoryGet(name, 1, boundary, boundary + 1, \
-            flag))
+  STATIC_HISTOGRAM_POINTER_BLOCK(                                     \
+      name, Add(base::underlying_value(sample)),                      \
+      base::LinearHistogram::FactoryGet(                              \
+          name, 1, base::underlying_value(boundary),                  \
+          base::underlying_value(boundary) + 1, flag))
 
 #define LOCAL_HISTOGRAM_PERCENTAGE(name, under_one_hundred) \
     LOCAL_HISTOGRAM_ENUMERATION(name, under_one_hundred, 101)