Mojom interface for Preferences

components/prefs/public/interfaces/preferences.mojom

Index: components/prefs/public/interfaces/preferences.mojom
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+// Copyright 2016 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;
+
+// A Preference could be one of several base types. PrefStore utilizes
+// base::Value to encompass these. TODO(jonross): create struct traits so that
+// we can pass base::Value via mojo.
+struct Preference {
+  enum PreferenceType { INT, STRING };
+
+  PreferenceType type;
+  uint32 integer_value_;
+  string? string_value_;
+};
+
+// A list of preference keys.
+struct PreferenceList {
+  array<string> preferences;
+};
+
+// A key-value mapping of preferences.
+struct PreferenceMap {
+  map<string, Preference> preferences;
+};
+
+// Used to subscribe to preference changes within PreferenceManager. After
+// requesting to observe, the current values for all requested keys are sent.
+interface PreferenceObserver {
+  OnPreferencesChanged(PreferenceMap preferences);
+};
+
+// Manages actual read/write of preference data. Accepts observers who subscribe
+// to preferences, notifying them of changes.
+interface PreferenceManager {
+  AddObserver(PreferenceList preferences, PreferenceObserver client);
+  SetPreferences(PreferenceMap preferences);
+};