Credential Manager: Add platform-exposed Credential objects.

public/platform/WebFederatedCredential.h

+// 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 WebFederatedCredential_h
+#define WebFederatedCredential_h
+
+#include "WebCommon.h"
+#include "WebCredential.h"
+#include "WebString.h"
+
+namespace blink {
+
+class WebFederatedCredential : public WebCredential {
+public:
+    BLINK_PLATFORM_EXPORT WebFederatedCredential(const WebString& id, const WebString& name, const WebString& avatarURL, const WebString& federation);
+
+    BLINK_PLATFORM_EXPORT void assign(const WebFederatedCredential&);
+
+    BLINK_PLATFORM_EXPORT WebString federation() const;
+};
+
+} // namespace blink
+
+#endif // WebFederatedCredential_h
+
+