Move tracked prefs into services/preferences/tracked.

components/user_prefs/tracked/tracked_preference_helper.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/user_prefs/tracked/tracked_preference_helper.h"
-
-#include "base/logging.h"
-#include "base/metrics/histogram.h"
-#include "base/metrics/histogram_macros.h"
-#include "components/user_prefs/tracked/tracked_preference_histogram_names.h"
-
-TrackedPreferenceHelper::TrackedPreferenceHelper(
-    const std::string& pref_path,
-    size_t reporting_id,
-    size_t reporting_ids_count,
-    PrefHashFilter::EnforcementLevel enforcement_level,
-    PrefHashFilter::ValueType value_type)
-    : pref_path_(pref_path),
-      reporting_id_(reporting_id),
-      reporting_ids_count_(reporting_ids_count),
-      enforce_(enforcement_level ==
-               PrefHashFilter::EnforcementLevel::ENFORCE_ON_LOAD),
-      personal_(value_type == PrefHashFilter::ValueType::PERSONAL) {}
-
-TrackedPreferenceHelper::ResetAction TrackedPreferenceHelper::GetAction(
-    PrefHashStoreTransaction::ValueState value_state) const {
-  switch (value_state) {
-    case PrefHashStoreTransaction::UNCHANGED:
-      // Desired case, nothing to do.
-      return DONT_RESET;
-    case PrefHashStoreTransaction::CLEARED:
-      // Unfortunate case, but there is nothing we can do.
-      return DONT_RESET;
-    case PrefHashStoreTransaction::TRUSTED_NULL_VALUE:  // Falls through.
-    case PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE:
-      // It is okay to seed the hash in this case.
-      return DONT_RESET;
-    case PrefHashStoreTransaction::SECURE_LEGACY:
-      // Accept secure legacy device ID based hashes.
-      return DONT_RESET;
-    case PrefHashStoreTransaction::UNSUPPORTED:
-      NOTREACHED()
-          << "GetAction should not be called with an UNSUPPORTED value state";
-      return DONT_RESET;
-    case PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE:  // Falls through.
-    case PrefHashStoreTransaction::CHANGED:
-      return enforce_ ? DO_RESET : WANTED_RESET;
-  }
-  NOTREACHED() << "Unexpected PrefHashStoreTransaction::ValueState: "
-               << value_state;
-  return DONT_RESET;
-}
-
-bool TrackedPreferenceHelper::IsPersonal() const {
-  return personal_;
-}
-
-void TrackedPreferenceHelper::ReportValidationResult(
-    PrefHashStoreTransaction::ValueState value_state,
-    base::StringPiece validation_type_suffix) const {
-  const char* histogram_name = nullptr;
-  switch (value_state) {
-    case PrefHashStoreTransaction::UNCHANGED:
-      histogram_name = user_prefs::tracked::kTrackedPrefHistogramUnchanged;
-      break;
-    case PrefHashStoreTransaction::CLEARED:
-      histogram_name = user_prefs::tracked::kTrackedPrefHistogramCleared;
-      break;
-    case PrefHashStoreTransaction::SECURE_LEGACY:
-      histogram_name =
-          user_prefs::tracked::kTrackedPrefHistogramMigratedLegacyDeviceId;
-      break;
-    case PrefHashStoreTransaction::CHANGED:
-      histogram_name = user_prefs::tracked::kTrackedPrefHistogramChanged;
-      break;
-    case PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE:
-      histogram_name = user_prefs::tracked::kTrackedPrefHistogramInitialized;
-      break;
-    case PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE:
-      histogram_name =
-          user_prefs::tracked::kTrackedPrefHistogramTrustedInitialized;
-      break;
-    case PrefHashStoreTransaction::TRUSTED_NULL_VALUE:
-      histogram_name =
-          user_prefs::tracked::kTrackedPrefHistogramNullInitialized;
-      break;
-    case PrefHashStoreTransaction::UNSUPPORTED:
-      NOTREACHED() << "ReportValidationResult should not be called with an "
-                      "UNSUPPORTED value state";
-      return;
-  }
-  DCHECK(histogram_name);
-
-  std::string full_histogram_name(histogram_name);
-  if (!validation_type_suffix.empty()) {
-    full_histogram_name.push_back('.');
-    validation_type_suffix.AppendToString(&full_histogram_name);
-  }
-
-  // Using FactoryGet to allow dynamic histogram names. This is equivalent to
-  // UMA_HISTOGRAM_ENUMERATION(name, reporting_id_, reporting_ids_count_);
-  base::HistogramBase* histogram = base::LinearHistogram::FactoryGet(
-      full_histogram_name, 1, reporting_ids_count_, reporting_ids_count_ + 1,
-      base::HistogramBase::kUmaTargetedHistogramFlag);
-  histogram->Add(reporting_id_);
-}
-
-void TrackedPreferenceHelper::ReportAction(ResetAction reset_action) const {
-  switch (reset_action) {
-    case DONT_RESET:
-      // No report for DONT_RESET.
-      break;
-    case WANTED_RESET:
-      UMA_HISTOGRAM_EXACT_LINEAR(
-          user_prefs::tracked::kTrackedPrefHistogramWantedReset, reporting_id_,
-          reporting_ids_count_);
-      break;
-    case DO_RESET:
-      UMA_HISTOGRAM_EXACT_LINEAR(
-          user_prefs::tracked::kTrackedPrefHistogramReset, reporting_id_,
-          reporting_ids_count_);
-      break;
-  }
-}
-
-void TrackedPreferenceHelper::ReportSplitPreferenceChangedCount(
-    size_t count) const {
-  // The histogram below is an expansion of the UMA_HISTOGRAM_COUNTS_100 macro
-  // adapted to allow for a dynamically suffixed histogram name.
-  // Note: The factory creates and owns the histogram.
-  base::HistogramBase* histogram = base::LinearHistogram::FactoryGet(
-      user_prefs::tracked::kTrackedSplitPrefHistogramChanged + pref_path_, 1,
-      100,  // Allow counts up to 100.
-      101, base::HistogramBase::kUmaTargetedHistogramFlag);
-  histogram->Add(count);
-}