Refactor histogram_persistence to be a class.

base/metrics/statistics_recorder_unittest.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 <stddef.h>
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_macros.h"
-#include "base/metrics/histogram_persistence.h"
+#include "base/metrics/persistent_histogram_allocator.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 class StatisticsRecorderTest : public testing::Test {
  protected:
   void SetUp() override {
     // Get this first so it never gets created in persistent storage and will
     // not appear in the StatisticsRecorder after it is re-initialized.
-    GetCreateHistogramResultHistogram();
+    PersistentHistogramAllocator::GetCreateHistogramResultHistogram();
     // Each test will have a clean state (no Histogram / BucketRanges
     // registered).
     InitializeStatisticsRecorder();
   }
 
   void TearDown() override {
     UninitializeStatisticsRecorder();
-    delete ReleasePersistentHistogramMemoryAllocatorForTesting();
+    PersistentHistogramAllocator::ReleaseGlobalAllocatorForTesting();
   }
 
   void InitializeStatisticsRecorder() {
     statistics_recorder_ = new StatisticsRecorder();
   }
 
   void UninitializeStatisticsRecorder() {
     delete statistics_recorder_;
     statistics_recorder_ = NULL;
   }
@@ skipping 273 matching lines @@
   UninitializeStatisticsRecorder();
 
   // No data should be returned.
   json = StatisticsRecorder::ToJSON(query);
   EXPECT_TRUE(json.empty());
 }
 
 TEST_F(StatisticsRecorderTest, IterationTest) {
   StatisticsRecorder::Histograms registered_histograms;
   LOCAL_HISTOGRAM_COUNTS("TestHistogram.IterationTest1", 30);
-  SetPersistentHistogramMemoryAllocator(
-      new LocalPersistentMemoryAllocator(64 << 10, 0, std::string()));
+  PersistentHistogramAllocator::CreateGlobalAllocatorOnLocalMemory(
+      64 << 10 /* 64 KiB */, 0, "");
   LOCAL_HISTOGRAM_COUNTS("TestHistogram.IterationTest2", 30);
 
   StatisticsRecorder::HistogramIterator i1 = StatisticsRecorder::begin(true);
   EXPECT_NE(StatisticsRecorder::end(), i1);
   EXPECT_NE(StatisticsRecorder::end(), ++i1);
   EXPECT_EQ(StatisticsRecorder::end(), ++i1);
 
   StatisticsRecorder::HistogramIterator i2 = StatisticsRecorder::begin(false);
   EXPECT_NE(StatisticsRecorder::end(), i2);
   EXPECT_EQ(StatisticsRecorder::end(), ++i2);
@@ skipping 167 matching lines @@
   HistogramBase* histogram = Histogram::FactoryGet("TestHistogram", 1, 1000, 10,
                                                    HistogramBase::kNoFlags);
   EXPECT_TRUE(histogram);
   histogram->Add(1);
 
   EXPECT_TRUE(callback_wrapper.called);
   EXPECT_EQ(callback_wrapper.last_histogram_value, 1);
 }
 
 }  // namespace base