Pref service: support for incognito prefs

services/preferences/public/interfaces/preferences_configuration.mojom

-// Copyright 2017 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.
-
-module prefs.mojom;
-
-import "mojo/common/file_path.mojom";
-import "mojo/common/string16.mojom";
-import "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom";
-
-union PersistentPrefStoreConfiguration {
-  SimplePersistentPrefStoreConfiguration simple_configuration;
-  TrackedPersistentPrefStoreConfiguration tracked_configuration;
-};
-
-struct SimplePersistentPrefStoreConfiguration {
-  mojo.common.mojom.FilePath pref_filename;
-};
-
-// These parameters are passed to prefs::CreateTrackedPersistentPrefStore() in
-// services/preferences/persistent_pref_store_factory.cc.
-struct TrackedPersistentPrefStoreConfiguration {
-  mojo.common.mojom.FilePath unprotected_pref_filename;
-  mojo.common.mojom.FilePath protected_pref_filename;
-  array<TrackedPreferenceMetadata> tracking_configuration;
-  uint64 reporting_ids_count;
-  string seed;
-  string legacy_device_id;
-  string registry_seed;
-  mojo.common.mojom.String16 registry_path;
-  TrackedPreferenceValidationDelegate? validation_delegate;
-  ResetOnLoadObserver? reset_on_load_observer;
-};
-
-struct TrackedPreferenceMetadata {
-  enum EnforcementLevel { NO_ENFORCEMENT, ENFORCE_ON_LOAD };
-
-  enum PrefTrackingStrategy {
-    // Atomic preferences are tracked as a whole.
-    ATOMIC,
-    // Split preferences are dictionaries for which each top-level entry is
-    // tracked independently. Note: preferences using this strategy must be kept
-    // in sync with TrackedSplitPreferences in histograms.xml.
-    SPLIT,
-  };
-
-  enum ValueType {
-    IMPERSONAL,
-    // The preference value may contain personal information.
-    PERSONAL,
-  };
-
-  uint64 reporting_id;
-  string name;
-  EnforcementLevel enforcement_level;
-  PrefTrackingStrategy strategy;
-  ValueType value_type;
-};
-
-interface ResetOnLoadObserver {
-  OnResetOnLoad();
-};