Add an Error class for ServiceWorkers

public/platform/WebServiceWorkerError.h

 /*
  * 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 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * 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.
  */
 
-#ifndef WebGraphicsContext3DProvider_h
-#define WebGraphicsContext3DProvider_h
+#ifndef WebServiceWorkerError_h
+#define WebServiceWorkerError_h
 
-#include "WebCommon.h"
-
-class GrContext;
+#include "WebString.h"
 
 namespace WebKit {
-class WebGraphicsContext3D;
 
-class WebGraphicsContext3DProvider {
-public:
-    virtual ~WebGraphicsContext3DProvider() { }
+struct WebServiceWorkerError {
+    enum ErrorType {
+        RegistrationError = 0,

[kinuko, 2013/10/16 01:46:30]

This looks to be more like 'error category' than 'error type'.

Should this be instead ServiceDisabledError, NetworkError etc?

+    };
 
-    virtual WebGraphicsContext3D* context3d() = 0;
-    virtual GrContext* grContext() = 0;
+    WebServiceWorkerError(ErrorType errorType, const WebString& message)
+        : errorType(errorType), message(message) { }
+
+    ErrorType errorType;
+    WebString message;
 };
 
 } // namespace WebKit
 
 #endif