Enable all registered types by default on Android.

chrome/browser/sync/glue/sync_backend_host.cc

 // 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.
 
 #include "build/build_config.h"
 
 #include "chrome/browser/sync/glue/sync_backend_host.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 348 matching lines @@
 // Helper to construct a user agent string (ASCII) suitable for use by
 // the syncapi for any HTTP communication. This string is used by the sync
 // backend for classifying client types when calculating statistics.
 std::string MakeUserAgentForSyncApi() {
   std::string user_agent;
   user_agent = "Chrome ";
 #if defined(OS_WIN)
   user_agent += "WIN ";
 #elif defined(OS_CHROMEOS)
   user_agent += "CROS ";
+#elif defined(OS_ANDROID)
+  user_agent += "ANDROID ";
 #elif defined(OS_LINUX)
   user_agent += "LINUX ";
 #elif defined(OS_FREEBSD)
   user_agent += "FREEBSD ";
 #elif defined(OS_OPENBSD)
   user_agent += "OPENBSD ";
 #elif defined(OS_MACOSX)
   user_agent += "MAC ";
 #endif
   chrome::VersionInfo version_info;
@@ skipping 1163 matching lines @@
     const syncer::ModelTypeSet failed_configuration_types) {
   HandleInitializationCompletedOnFrontendLoop(
       failed_configuration_types.Empty());
 }
 
 #undef SDVLOG
 
 #undef SLOG
 
 }  // namespace browser_sync