Update //base to chromium 9659b08ea5a34f889dc4166217f438095ddc10d2

base/metrics/histogram_base.cc

Index: base/metrics/histogram_base.cc
diff --git a/base/metrics/histogram_base.cc b/base/metrics/histogram_base.cc
index de34c79d4b4bfde9b063654e17e7db2cc880f38c..6b3f69c2c047a63198d6cf69e94ec6e29336e8b7 100644
--- a/base/metrics/histogram_base.cc
+++ b/base/metrics/histogram_base.cc
@@ -12,6 +12,7 @@
 #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"
@@ -117,6 +118,16 @@ void HistogramBase::WriteJSON(std::string* output) const {
   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 {