Sync bookmark app icon urls and sizes, and download icons for new 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 20 matching lines @@
   // OAuth2 client id to which the user granted the notification permission.
   // This field will start out empty.
   // It will be set when the user accepts receiving notifications.
   // This field is used when the user revokes the notifications permission.
   // Note that it is never cleared after it was set once. Hence, the presence
   // of this field can be used to determine if the user has setup notifications
   // at least once for the given app.
   optional string oauth_client_id = 3;
 }
 
+// Information about a linked app icon.
+message LinkedAppIconInfo {
+  // The URL of the app icon.
+  optional string url = 1;
+
+  // The size of the app icon in DIPs.
+  optional uint32 size = 2;
+}
+
 // 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;
@@ skipping 21 matching lines @@
   // This is the url of a bookmark app. If this exists, the app is a bookmark
   // app.
   optional string bookmark_app_url = 6;
 
   // This is the description of a bookmark app.
   optional string bookmark_app_description = 7;
 
   // This is the color to use when generating bookmark app icons. The string is
   // in #rrggbb or #rgb syntax, e.g. #d8d8d8.
   optional string bookmark_app_icon_color = 8;
+
+  // This is information about linked icons (that is, icons that are downloaded
+  // from outside the app's bundle of files.
+  repeated LinkedAppIconInfo linked_app_icons = 9;
 }