Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

base/metrics/histogram_functions_unittest.cc

 // 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.
 
 #include "base/metrics/histogram_functions.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/test/histogram_tester.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 29 matching lines @@
 TEST(HistogramFunctionsTest, HistogramEnumeration) {
   std::string histogram("Testing.UMA.HistogramEnumeration");
   HistogramTester tester;
   UmaHistogramEnumeration(histogram, UMA_HISTOGRAM_TESTING_ENUM_FIRST,
                           UMA_HISTOGRAM_TESTING_ENUM_THIRD);
   tester.ExpectUniqueSample(histogram, UMA_HISTOGRAM_TESTING_ENUM_FIRST, 1);
 
   // Verify the overflow & underflow bucket exists.
   UMA_HISTOGRAM_ENUMERATION(
       histogram, static_cast<int>(UMA_HISTOGRAM_TESTING_ENUM_THIRD) + 10,
-      UMA_HISTOGRAM_TESTING_ENUM_THIRD);
+      static_cast<int>(UMA_HISTOGRAM_TESTING_ENUM_THIRD));
   tester.ExpectBucketCount(
       histogram, static_cast<int>(UMA_HISTOGRAM_TESTING_ENUM_THIRD) + 1, 1);
   tester.ExpectTotalCount(histogram, 2);
 }
 
 TEST(HistogramFunctionsTest, HistogramBoolean) {
   std::string histogram("Testing.UMA.HistogramBoolean");
   HistogramTester tester;
   UmaHistogramBoolean(histogram, true);
   tester.ExpectUniqueSample(histogram, 1, 1);
@@ skipping 39 matching lines @@
   tester.ExpectTotalCount(histogram, 2);
   UmaHistogramTimes(histogram, TimeDelta::FromSeconds(10));  // Overflows
   tester.ExpectTimeBucketCount(histogram, TimeDelta::FromSeconds(10), 1);
   UmaHistogramTimes(histogram, TimeDelta::FromSeconds(20));  // Overflows.
   // Check the value by picking any overflow time.
   tester.ExpectTimeBucketCount(histogram, TimeDelta::FromSeconds(11), 2);
   tester.ExpectTotalCount(histogram, 4);
 }
 
 }  // namespace base.