Move base to DEPS

base/metrics/histogram_snapshot_manager.cc

Index: base/metrics/histogram_snapshot_manager.cc
diff --git a/base/metrics/histogram_snapshot_manager.cc b/base/metrics/histogram_snapshot_manager.cc
deleted file mode 100644
index a7605aa14179ac6b89a747a201fe0b285eb6dd2d..0000000000000000000000000000000000000000
--- a/base/metrics/histogram_snapshot_manager.cc
+++ /dev/null
@@ -1,113 +0,0 @@
-// 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 "base/metrics/histogram_snapshot_manager.h"
-
-#include "base/memory/scoped_ptr.h"
-#include "base/metrics/histogram_flattener.h"
-#include "base/metrics/histogram_samples.h"
-#include "base/metrics/statistics_recorder.h"
-#include "base/stl_util.h"
-
-namespace base {
-
-HistogramSnapshotManager::HistogramSnapshotManager(
-    HistogramFlattener* histogram_flattener)
-    : histogram_flattener_(histogram_flattener) {
-  DCHECK(histogram_flattener_);
-}
-
-HistogramSnapshotManager::~HistogramSnapshotManager() {
-  STLDeleteValues(&logged_samples_);
-}
-
-void HistogramSnapshotManager::PrepareDeltas(
-    HistogramBase::Flags flag_to_set,
-    HistogramBase::Flags required_flags) {
-  StatisticsRecorder::Histograms histograms;
-  StatisticsRecorder::GetHistograms(&histograms);
-  for (StatisticsRecorder::Histograms::const_iterator it = histograms.begin();
-       histograms.end() != it;
-       ++it) {
-    (*it)->SetFlags(flag_to_set);
-    if (((*it)->flags() & required_flags) == required_flags)
-      PrepareDelta(**it);
-  }
-}
-
-void HistogramSnapshotManager::PrepareDelta(const HistogramBase& histogram) {
-  DCHECK(histogram_flattener_);
-
-  // Get up-to-date snapshot of sample stats.
-  scoped_ptr<HistogramSamples> snapshot(histogram.SnapshotSamples());
-  const std::string& histogram_name = histogram.histogram_name();
-
-  int corruption = histogram.FindCorruption(*snapshot);
-
-  // Crash if we detect that our histograms have been overwritten.  This may be
-  // a fair distance from the memory smasher, but we hope to correlate these
-  // crashes with other events, such as plugins, or usage patterns, etc.
-  if (HistogramBase::BUCKET_ORDER_ERROR & corruption) {
-    // The checksum should have caught this, so crash separately if it didn't.
-    CHECK_NE(0, HistogramBase::RANGE_CHECKSUM_ERROR & corruption);
-    CHECK(false);  // Crash for the bucket order corruption.
-  }
-  // Checksum corruption might not have caused order corruption.
-  CHECK_EQ(0, HistogramBase::RANGE_CHECKSUM_ERROR & corruption);
-
-  // Note, at this point corruption can only be COUNT_HIGH_ERROR or
-  // COUNT_LOW_ERROR and they never arise together, so we don't need to extract
-  // bits from corruption.
-  if (corruption) {
-    DLOG(ERROR) << "Histogram: " << histogram_name
-                << " has data corruption: " << corruption;
-    histogram_flattener_->InconsistencyDetected(
-        static_cast<HistogramBase::Inconsistency>(corruption));
-    // Don't record corrupt data to metrics services.
-    int old_corruption = inconsistencies_[histogram_name];
-    if (old_corruption == (corruption | old_corruption))
-      return;  // We've already seen this corruption for this histogram.
-    inconsistencies_[histogram_name] |= corruption;
-    histogram_flattener_->UniqueInconsistencyDetected(
-        static_cast<HistogramBase::Inconsistency>(corruption));
-    return;
-  }
-
-  HistogramSamples* to_log;
-  std::map<std::string, HistogramSamples*>::iterator it =
-      logged_samples_.find(histogram_name);
-  if (it == logged_samples_.end()) {
-    to_log = snapshot.release();
-
-    // This histogram has not been logged before, add a new entry.
-    logged_samples_[histogram_name] = to_log;
-  } else {
-    HistogramSamples* already_logged = it->second;
-    InspectLoggedSamplesInconsistency(*snapshot, already_logged);
-    snapshot->Subtract(*already_logged);
-    already_logged->Add(*snapshot);
-    to_log = snapshot.get();
-  }
-
-  if (to_log->TotalCount() > 0)
-    histogram_flattener_->RecordDelta(histogram, *to_log);
-}
-
-void HistogramSnapshotManager::InspectLoggedSamplesInconsistency(
-      const HistogramSamples& new_snapshot,
-      HistogramSamples* logged_samples) {
-  HistogramBase::Count discrepancy =
-      logged_samples->TotalCount() - logged_samples->redundant_count();
-  if (!discrepancy)
-    return;
-
-  histogram_flattener_->InconsistencyDetectedInLoggedCount(discrepancy);
-  if (discrepancy > Histogram::kCommonRaceBasedCountMismatch) {
-    // Fix logged_samples.
-    logged_samples->Subtract(*logged_samples);
-    logged_samples->Add(new_snapshot);
-  }
-}
-
-}  // namespace base