Keep track of which attachments are referenced by which sync entries.

sync/syncable/directory_unittest.h

Index: sync/syncable/directory_unittest.h
diff --git a/sync/syncable/directory_unittest.h b/sync/syncable/directory_unittest.h
index 14e1a998eee96e700208555874e0a374bba73c7e..f1b2fe9d04a5376fbfb129fe0414fd05877e42c7 100644
--- a/sync/syncable/directory_unittest.h
+++ b/sync/syncable/directory_unittest.h
@@ -9,6 +9,8 @@
 
 #include "base/basictypes.h"
 #include "base/message_loop/message_loop.h"
+#include "sync/internal_api/public/base_node.h"
+#include "sync/internal_api/public/user_share.h"
 #include "sync/syncable/in_memory_directory_backing_store.h"
 #include "sync/syncable/mutable_entry.h"
 #include "sync/syncable/syncable_read_transaction.h"
@@ -54,6 +56,13 @@ class SyncableDirectoryTest : public testing::Test {
 
   void CreateEntry(const std::string& entryname, Id id);
 
+  // Create an entry with the given |model_type|, |client_tag| and
+  // |attachment_metadata|.
+  void CreateEntryWithAttachmentMetadata(
+      const ModelType& model_type,
+      const std::string& client_tag,
+      const sync_pb::AttachmentMetadata& attachment_metadata);
+
   // When a directory is saved then loaded from disk, it will pass through
   // DropDeletedEntries().  This will remove some entries from the directory.
   // This function is intended to simulate that process.
@@ -74,7 +83,19 @@ class SyncableDirectoryTest : public testing::Test {
   bool IsInDirtyMetahandles(int64 metahandle);
   bool IsInMetahandlesToPurge(int64 metahandle);
 
+  // Attempts to load the entry specified by |model_type| and |client_tag| and
+  // returns the lookup result code.
+  BaseNode::InitByLookupResult LookupEntryByClientTag(
+      const ModelType& model_type,
+      const std::string& client_tag);
+
+  // Replace the entry specified by |model_type| and |client_tag| with a
+  // tombstone.
+  void ReplaceWithTombstone(const ModelType& model_type,
+                            const std::string& client_tag);
+
   scoped_ptr<Directory>& dir();
+  UserShare* user_share();
   DirectoryChangeDelegate* directory_change_delegate();
   Encryptor* encryptor();
   UnrecoverableErrorHandler* unrecoverable_error_handler();
@@ -89,7 +110,7 @@ class SyncableDirectoryTest : public testing::Test {
                      bool is_del);
 
   base::MessageLoop message_loop_;
-  scoped_ptr<Directory> dir_;
+  syncer::UserShare user_share_;
   NullDirectoryChangeDelegate delegate_;
   FakeEncryptor encryptor_;
   TestUnrecoverableErrorHandler handler_;