Credential Manager: Add platform-exposed Credential objects.

Source/platform/credentialmanager/PlatformLocalCredential.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 "platform/credentialmanager/PlatformLocalCredential.h"
+
+namespace blink {
+
+PlatformLocalCredential* PlatformLocalCredential::create(const String& id, const String& name, const String& avatarURL, const String& password)
+{
+    return new PlatformLocalCredential(id, name, avatarURL, password);
+}
+
+PlatformLocalCredential::PlatformLocalCredential(const String& id, const String& name, const String& avatarURL, const String& password)
+    : PlatformCredential(id, name, avatarURL)
+    , m_password(password)
+{
+}
+
+PlatformLocalCredential::~PlatformLocalCredential()
+{
+}
+
+} // namespace blink
+