libchrome: Several upstreamable fixes from libchrome

base/metrics/histogram_base.cc

 // Copyright (c) 2012 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_base.h"
 
 #include <limits.h>
 
 #include <memory>
 #include <utility>
@@ skipping 79 matching lines @@
 void HistogramBase::AddBoolean(bool value) {
   Add(value ? 1 : 0);
 }
 
 bool HistogramBase::SerializeInfo(Pickle* pickle) const {
   if (!pickle->WriteInt(GetHistogramType()))
     return false;
   return SerializeInfoImpl(pickle);
 }
 
-uint32_t HistogramBase::FindCorruption(const HistogramSamples& samples) const {
+uint32_t HistogramBase::FindCorruption(
+    const HistogramSamples& /*samples*/) const {
   // Not supported by default.
   return NO_INCONSISTENCIES;
 }
 
 void HistogramBase::WriteJSON(std::string* output) const {
   Count count;
   int64_t sum;
   std::unique_ptr<ListValue> buckets(new ListValue());
   GetCountAndBucketData(&count, &sum, buckets.get());
   std::unique_ptr<DictionaryValue> parameters(new DictionaryValue());
@@ skipping 113 matching lines @@
         report_histogram_->Add(HISTOGRAM_REPORT_FLAG_UMA_TARGETED);
       break;
 
     case HISTOGRAM_LOOKUP:
       report_histogram_->Add(HISTOGRAM_REPORT_HISTOGRAM_LOOKUP);
       break;
   }
 }
 
 }  // namespace base