Credential Manager: Add platform-exposed Credential objects.

Source/platform/credentialmanager/PlatformCredential.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 PlatformCredential_h
+#define PlatformCredential_h
+
+#include "platform/heap/Handle.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class WebPlatformCredential;
+
+class PLATFORM_EXPORT PlatformCredential : public GarbageCollectedFinalized<PlatformCredential> {
+    WTF_MAKE_NONCOPYABLE(PlatformCredential);
+public:
+    static PlatformCredential* create(const String& id, const String& name, const String& avatarURL);
+    virtual ~PlatformCredential();
+
+    const String& id() const { return m_id; }
+    const String& name() const { return m_name; }
+    const String& avatarURL() const { return m_avatarURL; }
+
+    virtual void trace(Visitor*) { }
+
+protected:
+    PlatformCredential(const String& id, const String& name, const String& avatarURL);
+
+private:
+    String m_id;
+    String m_name;
+    String m_avatarURL;
+};
+
+} // namespace blink
+
+#endif // PlatformCredential_h