Introducing the WebServiceWorkerCacheStorage.

public/platform/WebServiceWorkerCacheStorageError.h

Index: public/platform/WebServiceWorkerCacheStorageError.h
diff --git a/public/platform/WebServiceWorkerCacheStorageError.h b/public/platform/WebServiceWorkerCacheStorageError.h
new file mode 100644
index 0000000000000000000000000000000000000000..3e3cc411a21ca96afdc267eef64d15b3193906b4
--- /dev/null
+++ b/public/platform/WebServiceWorkerCacheStorageError.h
@@ -0,0 +1,19 @@
+// Copyright 2014 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 WebServiceWorkerCacheStorageError_h
+#define WebServiceWorkerCacheStorageError_h
+
+namespace blink {
+
+enum WebServiceWorkerCacheStorageError {
+    WebServiceWorkerCacheStorageErrorNotImplemented,
+    WebServiceWorkerCacheStorageErrorNotFound,
+    WebServiceWorkerCacheStorageErrorExists,
+    WebServiceWorkerCacheStorageErrorLast = WebServiceWorkerCacheStorageErrorExists
+};
+
+} // namespace blink
+
+#endif // WebServiceWorkerCacheStorageError_h