Credential manager: Convert strings to URLs early.

Source/modules/credentialmanager/Credential.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 "modules/credentialmanager/Credential.h"
 
+#include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/ExceptionCode.h"
+
 namespace blink {
 
-Credential* Credential::create(const String& id, const String& name, const String& avatarURL)
+Credential* Credential::create(const String& id, const String& name, const KURL& avatar)
 {
+    return new Credential(id, name, avatar);
+}
+
+Credential* Credential::create(const String& id, const String& name, const String& avatar, ExceptionState& exceptionState)
+{
+    KURL avatarURL = parseStringAsURL(avatar, exceptionState);
+    if (exceptionState.hadException())
+        return nullptr;
     return new Credential(id, name, avatarURL);
 }
 
 Credential::Credential(PlatformCredential* credential)
     : m_platformCredential(credential)
 {
 }
 
-Credential::Credential(const String& id, const String& name, const String& avatarURL)
-    : m_platformCredential(PlatformCredential::create(id, name, avatarURL))
+Credential::Credential(const String& id, const String& name, const KURL& avatar)
+    : m_platformCredential(PlatformCredential::create(id, name, avatar))
 {
     ScriptWrappable::init(this);
 }
 
+KURL Credential::parseStringAsURL(const String& url, ExceptionState& exceptionState)
+{
+    KURL parsedURL = KURL(KURL(), url);
+    if (!parsedURL.isValid())
+        exceptionState.throwDOMException(SyntaxError, "'" + url + "' is not a valid URL.");
+    return parsedURL;
+}
+
 void Credential::trace(Visitor* visitor)
 {
     visitor->trace(m_platformCredential);
 }
 
 } // namespace blink