Assert enum type equivalence in UMA_HISTOGRAM_ENUMERATION

base/metrics/histogram_unittest.nc

Index: base/metrics/histogram_unittest.nc
diff --git a/base/metrics/histogram_unittest.nc b/base/metrics/histogram_unittest.nc
new file mode 100644
index 0000000000000000000000000000000000000000..0dfe1af050accf102a4fbb3fb484825183f1d4a3
--- /dev/null
+++ b/base/metrics/histogram_unittest.nc
@@ -0,0 +1,22 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This is a "No Compile Test" suite.
+// http://dev.chromium.org/developers/testing/no-compile-tests
+
+#include "base/metrics/histogram_macros.h"
+
+namespace base {
+
+#if defined(NCTEST_DIFFERENT_ENUM)  // [r"\|sample\| and \|boundary\| shouldn't be of different enums"]
+
+void WontCompile() {
+  enum TypeA { A };
+  enum TypeB { B };
+  UMA_HISTOGRAM_ENUMERATION("", A, B);
+}
+
+#endif
+
+}  // namespace base