Reorganize histograms for persistence.

components/metrics/histogram_encoder_unittest.cc

 // Copyright 2014 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 "components/metrics/histogram_encoder.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/metrics/bucket_ranges.h"
 #include "base/metrics/sample_vector.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 TEST(HistogramEncoder, HistogramBucketFields) {
   // Create buckets: 1-5, 5-7, 7-8, 8-9, 9-10, 10-11, 11-12.
   base::BucketRanges ranges(8);
   ranges.set_range(0, 1);
   ranges.set_range(1, 5);
   ranges.set_range(2, 7);
   ranges.set_range(3, 8);
   ranges.set_range(4, 9);
   ranges.set_range(5, 10);
   ranges.set_range(6, 11);
   ranges.set_range(7, 12);
 
-  base::SampleVector samples(&ranges);
+  base::SampleVector samples(1, &ranges);
   samples.Accumulate(3, 1);   // Bucket 1-5.
   samples.Accumulate(6, 1);   // Bucket 5-7.
   samples.Accumulate(8, 1);   // Bucket 8-9. (7-8 skipped)
   samples.Accumulate(10, 1);  // Bucket 10-11. (9-10 skipped)
   samples.Accumulate(11, 1);  // Bucket 11-12.
 
   ChromeUserMetricsExtension uma_proto;
   EncodeHistogramDelta("Test", samples, &uma_proto);
 
   const HistogramEventProto& histogram_proto =
@@ skipping 24 matching lines @@
   EXPECT_FALSE(histogram_proto.bucket(3).has_max());
   EXPECT_EQ(10, histogram_proto.bucket(3).min());
 
   // 11-12 becomes /-12 (last record must keep max, min is same as max - 1).
   EXPECT_FALSE(histogram_proto.bucket(4).has_min());
   EXPECT_TRUE(histogram_proto.bucket(4).has_max());
   EXPECT_EQ(12, histogram_proto.bucket(4).max());
 }
 
 }  // namespace metrics