Move StatisticsRecorder out of histogram.cc/h for further refactoring.

base/metrics/histogram_unittest.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.
 
 // Test of Histogram class
 
 #include <algorithm>
 #include <vector>
 
+#include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/statistics_recorder.h"
 #include "base/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace {
 
 class HistogramTest : public testing::Test {
 };
 
 // Check for basic syntax and use.
@@ skipping 422 matching lines @@
       "Histogram3", 1, 64, 16, Histogram::kNoFlags));
 
   CachedRanges* cached_ranges1 = histogram1->cached_ranges();
   CachedRanges* cached_ranges2 = histogram2->cached_ranges();
   CachedRanges* cached_ranges3 = histogram3->cached_ranges();
   EXPECT_TRUE(cached_ranges1->Equals(cached_ranges2));
   EXPECT_FALSE(cached_ranges1->Equals(cached_ranges3));
 }
 
 }  // namespace base