[NotLanded] Implement the fetching algorithm of the Web Manifest.

public/platform/WebManifestError.h

Index: public/platform/WebManifestError.h
diff --git a/public/platform/WebManifestError.h b/public/platform/WebManifestError.h
new file mode 100644
index 0000000000000000000000000000000000000000..55454e3906f4f0273492ae1cc4f7abd056bf86f0
--- /dev/null
+++ b/public/platform/WebManifestError.h
@@ -0,0 +1,17 @@
+// 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 WebManifestError_h
+#define WebManifestError_h
+
+namespace blink {
+
+enum WebManifestError {
+    NoManifest, // There is no manifest associated with the document.
+    FetchError, // Fetching the manifest resulted in an error.
+};
+
+} // namespace blink
+
+#endif