Update //base to chromium 9659b08ea5a34f889dc4166217f438095ddc10d2

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 <climits>
 
 #include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/sparse_histogram.h"
+#include "base/metrics/statistics_recorder.h"
 #include "base/pickle.h"
 #include "base/process/process_handle.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 
 namespace base {
 
 std::string HistogramTypeToString(HistogramType type) {
   switch (type) {
     case HISTOGRAM:
@@ skipping 85 matching lines @@
   root.SetString("name", histogram_name());
   root.SetInteger("count", count);
   root.SetDouble("sum", static_cast<double>(sum));
   root.SetInteger("flags", flags());
   root.Set("params", parameters.Pass());
   root.Set("buckets", buckets.Pass());
   root.SetInteger("pid", GetCurrentProcId());
   serializer.Serialize(root);
 }
 
+void HistogramBase::FindAndRunCallback(HistogramBase::Sample sample) const {
+  if ((flags_ & kCallbackExists) == 0)
+    return;
+
+  StatisticsRecorder::OnSampleCallback cb =
+      StatisticsRecorder::FindCallback(histogram_name());
+  if (!cb.is_null())
+    cb.Run(sample);
+}
+
 void HistogramBase::WriteAsciiBucketGraph(double current_size,
                                           double max_size,
                                           std::string* output) const {
   const int k_line_length = 72;  // Maximal horizontal width of graph.
   int x_count = static_cast<int>(k_line_length * (current_size / max_size)
                                  + 0.5);
   int x_remainder = k_line_length - x_count;
 
   while (0 < x_count--)
     output->append("-");
@@ skipping 12 matching lines @@
   return result;
 }
 
 void HistogramBase::WriteAsciiBucketValue(Count current,
                                           double scaled_sum,
                                           std::string* output) const {
   StringAppendF(output, " (%d = %3.1f%%)", current, current/scaled_sum);
 }
 
 }  // namespace base