Initialize StatisticsRecorder in Child Process to hold

base/metrics/histogram_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.
 
 // 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.
 TEST(HistogramTest, StartupShutdownTest) {
   // Try basic construction
   Histogram* histogram(Histogram::FactoryGet(
       "TestHistogram", 1, 1000, 10, Histogram::kNoFlags));
   EXPECT_NE(reinterpret_cast<Histogram*>(NULL), histogram);
@@ skipping 313 matching lines @@
   // Leave overflow bucket empty.
 
   // Check to see that the bucket counts reflect our additions.
   Histogram::SampleSet sample;
   histogram->SnapshotSample(&sample);
   EXPECT_EQ(INT_MAX, histogram->ranges(8));
   for (int i = 0; i < 8; i++)
     EXPECT_EQ(i + 1, sample.counts(i));
 }
 
-}  // namespace
-
-//------------------------------------------------------------------------------
-// We can't be an an anonymous namespace while being friends, so we pop back
-// out to the base namespace here.  We need to be friends to corrupt the
-// internals of the histogram and/or sampleset.
 TEST(HistogramTest, CorruptSampleCounts) {
   Histogram* histogram(Histogram::FactoryGet(
       "Histogram", 1, 64, 8, Histogram::kNoFlags));  // As per header file.
 
   EXPECT_EQ(0, histogram->sample_.redundant_count());
   histogram->Add(20);  // Add some samples.
   histogram->Add(40);
   EXPECT_EQ(2, histogram->sample_.redundant_count());
 
   Histogram::SampleSet snapshot;
@@ skipping 78 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