Add PrinterSpecifics to the sync protos.

components/sync/base/model_type.h

 // Copyright 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.
 
 // Enumerate the various item subtypes that are supported by sync.
 // Each sync object is expected to have an immutable object type.
 // An object's type is inferred from the type of data it holds.
 
 #ifndef COMPONENTS_SYNC_BASE_MODEL_TYPE_H_
 #define COMPONENTS_SYNC_BASE_MODEL_TYPE_H_
@@ skipping 114 matching lines @@
   // App List items
   APP_LIST,
   // WiFi credentials. Each item contains the information for connecting to one
   // WiFi network. This includes, e.g., network name and password.
   WIFI_CREDENTIALS,
   // Supervised user whitelists. Each item contains a CRX ID (like an extension
   // ID) and a name.
   SUPERVISED_USER_WHITELISTS,
   // Arc Package items.
   ARC_PACKAGE,
+  // Printer device information.
+  PRINTER,

[Nicolas Zea, 2016/09/07 00:18:04]

nit: the enum is typically plural, so this should be PRINTERS

[skau, 2016/09/09 19:02:15]

Done.

 
   // ---- Proxy types ----
   // Proxy types are excluded from the sync protocol, but are still considered
   // real user types. By convention, we prefix them with 'PROXY_' to distinguish
   // them from normal protocol types.
 
   // Tab sync. This is a placeholder type, so that Sessions can be implicitly
   // enabled for history sync and tabs sync.
   PROXY_TABS,
   FIRST_PROXY_TYPE = PROXY_TABS,
@@ skipping 202 matching lines @@
 
 // Returns true if |model_type| supports parent-child hierarchy or entries.
 bool TypeSupportsHierarchy(ModelType model_type);
 
 // Returns true if |model_type| supports ordering of sibling entries.
 bool TypeSupportsOrdering(ModelType model_type);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_MODEL_TYPE_H_