Move histogram_manager from components/metrics to components/cronet

components/metrics/histogram_manager.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_manager.h"
-
-#include <string>
-#include <vector>
-
-#include "base/lazy_instance.h"
-#include "base/metrics/histogram.h"
-#include "base/metrics/histogram_samples.h"
-#include "components/metrics/histogram_encoder.h"
-
-namespace metrics {
-
-// TODO(rtenneti): move g_histogram_manager into java code.
-static base::LazyInstance<HistogramManager>::Leaky
-    g_histogram_manager = LAZY_INSTANCE_INITIALIZER;
-
-HistogramManager::HistogramManager() : histogram_snapshot_manager_(this) {
-}
-
-HistogramManager::~HistogramManager() {
-}
-
-// static
-HistogramManager* HistogramManager::GetInstance() {
-  return g_histogram_manager.Pointer();
-}
-
-void HistogramManager::RecordDelta(const base::HistogramBase& histogram,
-                                   const base::HistogramSamples& snapshot) {
-  EncodeHistogramDelta(histogram.histogram_name(), snapshot, &uma_proto_);
-}
-
-void HistogramManager::InconsistencyDetected(
-    base::HistogramBase::Inconsistency problem) {
-  UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowser.Cronet",
-                            problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
-}
-
-void HistogramManager::UniqueInconsistencyDetected(
-    base::HistogramBase::Inconsistency problem) {
-  UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowserUnique.Cronet",
-                            problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
-}
-
-void HistogramManager::InconsistencyDetectedInLoggedCount(int amount) {
-  UMA_HISTOGRAM_COUNTS("Histogram.InconsistentSnapshotBrowser.Cronet",
-                       std::abs(amount));
-}
-
-bool HistogramManager::GetDeltas(std::vector<uint8>* data) {
-  // Clear the protobuf between calls.
-  uma_proto_.Clear();
-  histogram_snapshot_manager_.PrepareDeltas(
-      base::Histogram::kNoFlags, base::Histogram::kUmaTargetedHistogramFlag);
-  int32_t data_size = uma_proto_.ByteSize();
-  data->resize(data_size);
-  if (uma_proto_.SerializeToArray(&(*data)[0], data_size))
-    return true;
-  data->clear();
-  return false;
-}
-
-}  // namespace metrics