WIP: Pref service user prefs.

services/preferences/public/interfaces/preferences.mojom

Index: services/preferences/public/interfaces/preferences.mojom
diff --git a/services/preferences/public/interfaces/preferences.mojom b/services/preferences/public/interfaces/preferences.mojom
index 2f6cfdd584d896c52673255cacae5a94b79b6db7..dc6f1df7b1aef0880b2a4180a260a36ecb1c7231 100644
--- a/services/preferences/public/interfaces/preferences.mojom
+++ b/services/preferences/public/interfaces/preferences.mojom
@@ -4,7 +4,10 @@
 
 module prefs.mojom;
 
+import "mojo/common/file_path.mojom";
+import "mojo/common/string16.mojom";
 import "mojo/common/values.mojom";
+import "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom";
 
 const string kServiceName = "preferences";
 
@@ -91,3 +94,93 @@ interface PrefStoreConnector {
   // be received.
   Connect() => (map<PrefStoreType, PrefStoreConnection> connections);
 };
+
+// A persistent PrefStore. This
+interface PersistentPrefStore {
+  // Null |value| indicates a delete. |flags| is a bitmask of
+  // WritablePrefStore::PrefWriteFlags.
+  SetValue(string key, mojo.common.mojom.Value? value, uint32 flags);
+
+  CommitPendingWrite();
+  SchedulePendingLossyWrites();
+  ClearMutableValues();
+};
+
+interface PersistentPrefStoreConnector {
+  enum ReadError {
+    NONE = 0,
+    JSON_PARSE = 1,
+    JSON_TYPE = 2,
+    ACCESS_DENIED = 3,
+    FILE_OTHER = 4,
+    FILE_LOCKED = 5,
+    NO_FILE = 6,
+    JSON_REPEAT = 7,
+    // OTHER = 8,  // Deprecated.
+    FILE_NOT_SPECIFIED = 9,
+    ASYNCHRONOUS_TASK_INCOMPLETE = 10,
+  };
+
+  // A null |preferences| indicates that the pref service failed to load prefs.
+  [Sync]
+  Connect() => (
+      ReadError read_error,
+      bool read_only,
+      mojo.common.mojom.DictionaryValue? preferences,
+      PersistentPrefStore? pref_store,
+      PrefStoreObserver&? observer);
+};
+
+interface ResetOnLoadObserver {
+  OnResetOnLoad();
+};
+
+interface PersistentPrefStoreInit {
+  Init(UserPrefsConfiguration configuration);
+};
+
+union UserPrefsConfiguration {
+  SimpleUserPrefsConfiguration simple_configuration;
+  SegregatedUserPrefsConfiguration segregated_configuration;
+};
+
+struct SimpleUserPrefsConfiguration {
+  mojo.common.mojom.FilePath pref_filename;
+};
+
+struct SegregatedUserPrefsConfiguration {
+  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;
+  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;
+};