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

public/platform/WebManifestRequest.h

Index: public/platform/WebManifestRequest.h
diff --git a/public/platform/WebManifestRequest.h b/public/platform/WebManifestRequest.h
new file mode 100644
index 0000000000000000000000000000000000000000..97f11a89081944d5c363cb44c058e16ecbaabc79
--- /dev/null
+++ b/public/platform/WebManifestRequest.h
@@ -0,0 +1,29 @@
+// 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 WebManifestRequest_h
+#define WebManifestRequest_h
+
+namespace blink {
+
+struct WebManifest;
+
+// The WebManifestRequest interface is used when request a WebManifest from a
+// WebFrame. On failure, requestFailed() will be called with a FailureReason.
+// On success, requestSucceeded() will be called with the parsed WebManifest
+// object passed as an argument.
+class WebManifestRequest {
+public:
+    enum FailureReason {
+        NoLinkManifest,
+        NetworkError,
+    };
+
+    virtual void requestSucceeded(const WebManifest&) = 0;
+    virtual void requestFailed(FailureReason) = 0;
+};
+
+} // namespace blink
+
+#endif // WebManifestRequest_h