Add an Error class for ServiceWorkers

public/platform/WebServiceWorkerError.h

Index: public/platform/WebServiceWorkerError.h
diff --git a/public/web/WebDOMProgressEvent.h b/public/platform/WebServiceWorkerError.h
similarity index 82%
copy from public/web/WebDOMProgressEvent.h
copy to public/platform/WebServiceWorkerError.h
index d8db15587695dfe4141eceb164456da9a03342a5..084510723bd4b23b875b65305903b824b87696ce 100644
--- a/public/web/WebDOMProgressEvent.h
+++ b/public/platform/WebServiceWorkerError.h
@@ -28,19 +28,21 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebDOMProgressEvent_h
-#define WebDOMProgressEvent_h
+#ifndef WebServiceWorkerError_h
+#define WebServiceWorkerError_h
 
-#include "WebDOMEvent.h"
+#include "WebString.h"
 
 namespace WebKit {
 
-class WebString;
-
-class WebDOMProgressEvent : public WebDOMEvent {
+class WebServiceWorkerError {
 public:
-    WebDOMProgressEvent() { }
-    BLINK_EXPORT WebDOMProgressEvent(const WebString& type, bool lengthIsComputable, unsigned long long loaded, unsigned long long total);
+    enum ErrorType {
+        RegistrationError = 0,
+    };
+    virtual ~WebServiceWorkerError() { };
+    ErrorType errorType() { return RegistrationError; }
+    virtual const WebString message() { return WebString(); }

[kinuko, 2013/10/15 23:44:44]

Do we want to have implementation of this interface in the embedder?  I'm
feeling that this could just provide real implementation and ctor like
WebServiceWorkerError(ErrorType error, const WebString& message).  Then chromium
side can just use the exported ctor & methods.  Some error code (like
WebSocketStreamError, WebGeolocationError (in public/web)) follows this pattern.

 };
 
 } // namespace WebKit