Add 'Dump Database' tab to syncfs-internals (only for v2 for now)

chrome/browser/sync_file_system/sync_file_system_service.cc

Index: chrome/browser/sync_file_system/sync_file_system_service.cc
diff --git a/chrome/browser/sync_file_system/sync_file_system_service.cc b/chrome/browser/sync_file_system/sync_file_system_service.cc
index 06e30fbe14198132bfc1e3a5844c746aa4f50365..11b2c20a2f2ad8e7c92dba8b92f4c4410ab59d18 100644
--- a/chrome/browser/sync_file_system/sync_file_system_service.cc
+++ b/chrome/browser/sync_file_system/sync_file_system_service.cc
@@ -324,6 +324,10 @@ void SyncFileSystemService::DumpFiles(const GURL& origin,
                  AsWeakPtr(), origin, callback));
 }
 
+scoped_ptr<base::ListValue> SyncFileSystemService::DumpDatabase() {
+  return remote_service_->DumpDatabase();
+}
+
 void SyncFileSystemService::GetFileSyncStatus(
     const FileSystemURL& url, const SyncFileStatusCallback& callback) {
   DCHECK(local_service_);