diff --git a/dart_script_loader_sync.h b/dart_script_loader_sync.h
new file mode 100644
index 0000000..442769e
--- /dev/null
+++ b/dart_script_loader_sync.h
@@ -0,0 +1,33 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TONIC_DART_SCRIPT_LOADER_SYNC_H_
+#define TONIC_DART_SCRIPT_LOADER_SYNC_H_
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "dart/runtime/include/dart_api.h"
+
+namespace tonic {
+
+class DartLibraryProvider;
+
+class DartScriptLoaderSync {
+ public:
+  // Blocks until |script_uri| and all of its dependencies have been loaded
+  // into the current isolate.
+  static void LoadScript(const std::string& script_uri,
+                         DartLibraryProvider* library_provider);
+};
+
+}  // namespace tonic
+
+#endif  // TONIC_DART_SCRIPT_LOADER_SYNC_H_