Implement SyncEngine::DumpFiles()

chrome/browser/sync_file_system/drive_backend/drive_backend_util.h

Index: chrome/browser/sync_file_system/drive_backend/drive_backend_util.h
diff --git a/chrome/browser/sync_file_system/drive_backend/drive_backend_util.h b/chrome/browser/sync_file_system/drive_backend/drive_backend_util.h
index 240bfcf472e124ef87f9a5a0d9183ff2685254da..03e30d522c76937cfee7c5c882db541dbdbf454f 100644
--- a/chrome/browser/sync_file_system/drive_backend/drive_backend_util.h
+++ b/chrome/browser/sync_file_system/drive_backend/drive_backend_util.h
@@ -5,7 +5,10 @@
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_DRIVE_BACKEND_UTIL_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_DRIVE_BACKEND_UTIL_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/sync_file_system/drive_backend/metadata_database.pb.h"
 #include "webkit/common/blob/scoped_file.h"
 
 namespace google_apis {
@@ -20,11 +23,6 @@ class WriteBatch;
 namespace sync_file_system {
 namespace drive_backend {
 
-class FileDetails;
-class FileMetadata;
-class FileTracker;
-class ServiceMetadata;
-
 void PutServiceMetadataToBatch(const ServiceMetadata& service_metadata,
                                leveldb::WriteBatch* batch);
 void PutFileToBatch(const FileMetadata& file, leveldb::WriteBatch* batch);
@@ -43,6 +41,8 @@ scoped_ptr<FileMetadata> CreateFileMetadataFromChangeResource(
 // IO-allowed thread.
 webkit_blob::ScopedFile CreateTemporaryFile();
 
+std::string FileKindToString(FileKind file_kind);
+
 }  // namespace drive_backend
 }  // namespace sync_file_system