Pass signin_scoped_device_id to DeviceInfoSpecifics.

chrome/browser/sync/glue/sync_backend_host_core.h

Index: chrome/browser/sync/glue/sync_backend_host_core.h
diff --git a/chrome/browser/sync/glue/sync_backend_host_core.h b/chrome/browser/sync/glue/sync_backend_host_core.h
index 635a3312c17965589dc4abb38a977f7bf668a351..9b1ba67e1719c5eb891a1eb58794636684bce7d9 100644
--- a/chrome/browser/sync/glue/sync_backend_host_core.h
+++ b/chrome/browser/sync/glue/sync_backend_host_core.h
@@ -36,12 +36,11 @@ struct DoInitializeOptions {
       bool delete_sync_data_folder,
       const std::string& restored_key_for_bootstrapping,
       const std::string& restored_keystore_key_for_bootstrapping,
-      scoped_ptr<syncer::InternalComponentsFactory>
-          internal_components_factory,
-      scoped_ptr<syncer::UnrecoverableErrorHandler>
-          unrecoverable_error_handler,
+      scoped_ptr<syncer::InternalComponentsFactory> internal_components_factory,
+      scoped_ptr<syncer::UnrecoverableErrorHandler> unrecoverable_error_handler,
       syncer::ReportUnrecoverableErrorFunction
-          report_unrecoverable_error_function);
+          report_unrecoverable_error_function,
+      const std::string& signin_scoped_device_id);
   ~DoInitializeOptions();
 
   base::MessageLoop* sync_loop;
@@ -64,6 +63,7 @@ struct DoInitializeOptions {
   scoped_ptr<syncer::UnrecoverableErrorHandler> unrecoverable_error_handler;
   syncer::ReportUnrecoverableErrorFunction
       report_unrecoverable_error_function;
+  std::string signin_scoped_device_id;
 };
 
 // Helper struct to handle currying params to
@@ -322,6 +322,10 @@ class SyncBackendHostCore
   // Set when the forwarding of per-type debug counters is enabled.
   bool forward_type_info_;
 
+  // Obtained from SigninClient::GetSigninScopedDeviceId(). Stored here just to
+  // pass from SyncBackendHostImpl to SyncedDeviceTracker.
+  std::string signin_scoped_device_id_;
+
   base::WeakPtrFactory<SyncBackendHostCore> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostCore);