Sync: Add DeviceInfo's ChangeProcessor

sync/internal_api/public/test/test_user_share.h

Index: sync/internal_api/public/test/test_user_share.h
diff --git a/sync/internal_api/public/test/test_user_share.h b/sync/internal_api/public/test/test_user_share.h
index 507a2ed09ebc10fb778407e80daa74e2ead88ac4..65889459b7fd46d849e82a05b8d5c0e020790ca4 100644
--- a/sync/internal_api/public/test/test_user_share.h
+++ b/sync/internal_api/public/test/test_user_share.h
@@ -39,6 +39,10 @@ namespace syncer {
 class SyncEncryptionHandler;
 class TestDirectorySetterUpper;
 
+namespace syncable {
+  class TestTransactionObserver;
+}
+
 class TestUserShare {
  public:
   TestUserShare();
@@ -61,6 +65,10 @@ class TestUserShare {
   // methods normally handled via the SyncBackendHost
   SyncEncryptionHandler* encryption_handler();
 
+  // Returns the directory's transaction observer.  This transaction observer
+  // has methods which can be helpful when writing test assertions.
+  syncable::TestTransactionObserver* transaction_observer();
+
   // A helper function to pretend to download this type's root node.
   static bool CreateRoot(syncer::ModelType model_type,
                          syncer::UserShare* service);