Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

base/metrics/histogram_unittest.nc

 // 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_functions.h"
 #include "base/metrics/histogram_macros.h"
 
@@ skipping 32 matching lines @@
 }
 
 #elif defined(NCTEST_ENUM_MAX_OUT_OF_RANGE)  // [r'static_assert failed "\|boundary\| is out of range of HistogramBase::Sample"']
 
 void WontCompile() {
   // HistogramBase::Sample is an int and can't hold larger values.
   enum class TypeA : uint32_t { A = 0xffffffff };
   UMA_HISTOGRAM_ENUMERATION("", TypeA::A, TypeA::A);
 }
 
+#elif defined(NCTEST_SAMPLE_NOT_ENUM)  // [r'static_assert failed "Unexpected: \|boundary\| is enum, but \|sample\| is not."']
+
+void WontCompile() {
+  enum TypeA { A };
+  UMA_HISTOGRAM_ENUMERATION("", 0, TypeA::A);
+}
+
 #elif defined(NCTEST_FUNCTION_INT)  // [r"Non enum passed to UmaHistogramEnumeration"]
 
 void WontCompile() {
   UmaHistogramEnumeration("", 1, 2);
 }
 
 #elif defined(NCTEST_FUNCTION_DIFFERENT_ENUM)  // [r"no matching function for call to 'UmaHistogramEnumeration'"]
 
 void WontCompile() {
   enum TypeA { A };
@@ skipping 11 matching lines @@
 #elif defined(NCTEST_FUNCTION_SECOND_NOT_ENUM)  // [r"no matching function for call to 'UmaHistogramEnumeration'"]
 
 void WontCompile() {
   enum TypeA { A };
   UmaHistogramEnumeration("", A, 2);
 }
 
 #endif
 
 }  // namespace base