Credential Manager: Add platform-exposed Credential objects.

Source/platform/exported/WebCredential.cpp

+// 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.
+
+#include "config.h"
+#include "public/platform/WebCredential.h"
+
+#include "platform/credentialmanager/PlatformCredential.h"
+
+namespace blink {
+
+WebCredential::WebCredential(const WebString& id, const WebString& name, const WebString& avatarURL)
+    : m_private(PlatformCredential::create(id, name, avatarURL))
+{
+}
+
+void WebCredential::assign(const WebCredential& other)
+{
+    m_private = other.m_private;
+}
+
+WebCredential::WebCredential(PlatformCredential* credential)
+    : m_private(credential)
+{
+}
+
+void WebCredential::reset()
+{
+    m_private.reset();
+}
+
+WebString WebCredential::id() const
+{
+    return m_private->id();
+}
+
+WebString WebCredential::name() const
+{
+    return m_private->name();
+}
+
+WebString WebCredential::avatarURL() const
+{
+    return m_private->avatarURL();
+}
+
+} // namespace blink