Sync the launch type pref for apps.

sync/protocol/app_specifics.proto

 // Copyright (c) 2012 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.
 //
 // Sync protocol datatype extension for apps.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 29 matching lines @@
 
 // Properties of app sync objects.
 //
 // For now, an app is just an extension.  We keep the two data types
 // separate for future-proofing purposes.
 message AppSpecifics {
   // Extension data.
   optional ExtensionSpecifics extension = 1;
 
   // Notification settings.
-  optional AppNotificationSettings notification_settings = 2; 
+  optional AppNotificationSettings notification_settings = 2;
 
   // This controls where on a page this application icon will appear.
   optional string app_launch_ordinal = 3;
 
   // This specifics which page the application icon will appear on in the NTP.
   // This values only provide the order within the application pages, not within
   // all of the panels in the NTP.
   optional string page_ordinal = 4;
+
+  // The possible launch types for an app.
+  // This enum should be kept in sync with extensions::LaunchType.
+  enum LaunchType {
+    PINNED = 0;
+    REGULAR = 1;
+    FULLSCREEN = 2;
+    WINDOW = 3;
+  }
+
+  // This describes how the extension should be launched.
+  optional LaunchType launch_type = 5;
 }
-