Add new UseCounter metric

third_party/WebKit/Source/platform/testing/HistogramTester.cpp

 // 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 "platform/testing/HistogramTester.h"
 
 #include "base/test/histogram_tester.h"
 #include "wtf/PtrUtil.h"
 
 namespace blink {
 
 HistogramTester::HistogramTester() : m_histogramTester(wrapUnique(new base::HistogramTester)) { }
 
 HistogramTester::~HistogramTester() { }
 
 void HistogramTester::expectUniqueSample(const std::string& name, base::HistogramBase::Sample sample, base::HistogramBase::Count count) const
 {
     m_histogramTester->ExpectUniqueSample(name, sample, count);
 }
 
+void HistogramTester::expectBucketCount(const std::string& name, base::HistogramBase::Sample sample, base::HistogramBase::Count count) const
+{
+    m_histogramTester->ExpectBucketCount(name, sample, count);
+}
+
 void HistogramTester::expectTotalCount(const std::string& name, base::HistogramBase::Count count) const
 {
     m_histogramTester->ExpectTotalCount(name, count);
 }
 
 } // namespace blink