Mojom interface for Preferences

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
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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;
+
+import "mojo/common/common_custom_types.mojom";
+
+// Used to subscribe to preference changes within PreferenceManager. After
+// requesting to observe, the current values for all requested keys are sent.
+interface PreferencesObserver {
+  OnPreferencesChanged(mojo.common.mojom.DictionaryValue preferences);
+};
+
+// Manages actual read/write of preference data. Accepts observers who subscribe
+// to preferences, notifying them of changes.
+interface PreferencesManager {
+  AddObserver(array<string> preferences, PreferencesObserver client);
+  SetPreferences(mojo.common.mojom.DictionaryValue preferences);
+};