diff --git a/components/crx_file/crx_creator.h b/components/crx_file/crx_creator.h
new file mode 100644
index 0000000..a8c2094
--- /dev/null
+++ b/components/crx_file/crx_creator.h
@@ -0,0 +1,35 @@
+// Copyright 2017 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 COMPONENTS_CRX_FILE_CRX_CREATOR_H_
+#define COMPONENTS_CRX_FILE_CRX_CREATOR_H_
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+namespace crypto {
+class RSAPrivateKey;
+}  // namespace crypto
+
+namespace crx_file {
+
+enum class CreatorResult {
+  OK,  // The CRX file was successfully created.
+  ERROR_SIGNING_FAILURE,
+  ERROR_FILE_NOT_READABLE,
+  ERROR_FILE_NOT_WRITABLE,
+  ERROR_FILE_WRITE_FAILURE,
+};
+
+// Create a CRX3 file at |output_path|, using the contents of the ZIP archive
+// located at |zip_path| and signing with (and deriving the CRX ID from)
+// |signing_key|.
+CreatorResult Create(const base::FilePath& output_path,
+                     const base::FilePath& zip_path,
+                     crypto::RSAPrivateKey* signing_key);
+
+}  // namespace crx_file
+
+#endif  // COMPONENTS_CRX_FILE_CRX_CREATOR_H_