Add an Error class for ServiceWorkers

Source/modules/serviceworkers/ServiceWorkerError.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 11 matching lines @@
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
-#include "core/html/HTMLMediaSource.h"
+#include "ServiceWorkerError.h"
 
+using WebKit::WebServiceWorkerError;

[abarth-chromium, 2013/10/25 15:37:16]

Why do you have this using directive and then use the type with the explicit
WebKit:: namespace.  Either is fine, but doing both is redundant.

[alecflett, 2013/10/25 23:05:33]

Done. (oops, oversight)

 namespace WebCore {
 
-URLRegistry* HTMLMediaSource::s_registry = 0;
-
-void HTMLMediaSource::setRegistry(URLRegistry* registry)
+String ServiceWorkerError::getErrorString(WebKit::WebServiceWorkerError::ErrorType type)
 {
-    ASSERT(!s_registry);
-    s_registry = registry;
+    switch (type) {
+    case WebServiceWorkerError::DisabledError:
+        return "DisabledError";
+    default:
+        ASSERT_NOT_REACHED();
+    }
 }
 
 }