Add metrics for DHCP WPAD feature.

base/metrics/histogram.cc

 // Copyright (c) 2011 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.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 // See header file for details and examples.
 
 #include "base/metrics/histogram.h"
@@ skipping 922 matching lines @@
   DCHECK_EQ(histogram->histogram_type(), CUSTOM_HISTOGRAM);
   DCHECK(histogram->HasConstructorArguments(ranges[1], ranges.back(),
                                             ranges.size()));
   return histogram;
 }
 
 Histogram::ClassType CustomHistogram::histogram_type() const {
   return CUSTOM_HISTOGRAM;
 }
 
+// static
+std::vector<Histogram::Sample> CustomHistogram::ArrayToCustomRanges(
+    const Sample* values, size_t num_values) {
+  std::vector<Sample> all_values;
+  for (size_t i = 0; i < num_values; ++i) {
+    Sample value = values[i];
+    all_values.push_back(value);
+
+    // Ensure that a guard bucket is added. If we end up with duplicate
+    // values, FactoryGet will take care of removing them.
+    all_values.push_back(value + 1);
+  }
+  return all_values;
+}
+
 CustomHistogram::CustomHistogram(const std::string& name,
                                  const std::vector<Sample>& custom_ranges)
     : Histogram(name, custom_ranges[1], custom_ranges.back(),
                 custom_ranges.size()) {
   DCHECK_GT(custom_ranges.size(), 1u);
   DCHECK_EQ(custom_ranges[0], 0);
 }
 
 void CustomHistogram::InitializedCustomBucketRange(
     const std::vector<Sample>& custom_ranges) {
@@ skipping 169 matching lines @@
 }
 
 // static
 StatisticsRecorder::HistogramMap* StatisticsRecorder::histograms_ = NULL;
 // static
 base::Lock* StatisticsRecorder::lock_ = NULL;
 // static
 bool StatisticsRecorder::dump_on_exit_ = false;
 
 }  // namespace base