sync: Add DeviceInfo protobuf and supporting code

sync/protocol/sync.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 for communication between sync client and server.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 option retain_unknown_fields = true;
 
 package sync_pb;
 
 import "app_notification_specifics.proto";
 import "app_setting_specifics.proto";
 import "app_specifics.proto";
 import "autofill_specifics.proto";
 import "bookmark_specifics.proto";
-import "get_updates_caller_info.proto";
+import "client_commands.proto";
+import "client_debug_info.proto";
+import "device_info_specifics.proto";
+import "encryption.proto";
 import "extension_setting_specifics.proto";
 import "extension_specifics.proto";
+import "get_updates_caller_info.proto";
 import "nigori_specifics.proto";
 import "password_specifics.proto";
 import "preference_specifics.proto";
 import "search_engine_specifics.proto";
 import "session_specifics.proto";
+import "sync_enums.proto";
 import "theme_specifics.proto";
 import "typed_url_specifics.proto";
-import "encryption.proto";
-import "sync_enums.proto";
-import "client_commands.proto";
-import "client_debug_info.proto";
 
 // Used for inspecting how long we spent performing operations in different
 // backends. All times must be in millis.
 message ProfilingData {
   optional int64 meta_data_write_time = 1;
   optional int64 file_data_write_time = 2;
   optional int64 user_lookup_time = 3;
   optional int64 meta_data_read_time = 4;
   optional int64 file_data_read_time = 5;
   optional int64 total_request_time = 6;
@@ skipping 44 matching lines @@
   optional AppNotification app_notification = 45184;
   optional PasswordSpecifics password = 45873;
   optional NigoriSpecifics nigori = 47745;
   optional ExtensionSpecifics extension = 48119;
   optional AppSpecifics app = 48364;
   optional SessionSpecifics session = 50119;
   optional AutofillProfileSpecifics autofill_profile = 63951;
   optional SearchEngineSpecifics search_engine = 88610;
   optional ExtensionSettingSpecifics extension_setting = 96159;
   optional AppSettingSpecifics app_setting = 103656;
+  optional DeviceInfoSpecifics device_info = 154522;
 }
 
 message SyncEntity {
   // This item's identifier.  In a commit of a new item, this will be a
   // client-generated ID.  If the commit succeeds, the server will generate
   // a globally unique ID and return it to the committing client in the
   // CommitResponse.EntryResponse.  In the context of a GetUpdatesResponse,
   // |id_string| is always the server generated ID.  The original
   // client-generated ID is preserved in the |originator_client_id| field.
   // Present in both GetUpdatesResponse and CommitMessage.
@@ skipping 578 matching lines @@
     // is absent then the whole client (all datatypes) is throttled.
     repeated int32 error_data_type_ids = 5;
   }
   optional Error error = 13;
 
   // The new per-client state for this client. If set, should be persisted and
   // sent with any subsequent ClientToServerMessages.
   optional ChipBag new_bag_of_chips = 14;
 };