Add an Error class for ServiceWorkers

Source/modules/serviceworkers/ServiceWorkerError.h

Index: Source/modules/serviceworkers/ServiceWorkerError.h
diff --git a/Source/core/html/ime/Composition.h b/Source/modules/serviceworkers/ServiceWorkerError.h
similarity index 69%
copy from Source/core/html/ime/Composition.h
copy to Source/modules/serviceworkers/ServiceWorkerError.h
index 43054668f0d17b4911e7af24a0db6f0606a7e868..1c29ea5e6db1d1b5459ab751ed7441e10195238b 100644
--- a/Source/core/html/ime/Composition.h
+++ b/Source/modules/serviceworkers/ServiceWorkerError.h
@@ -28,36 +28,32 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef Composition_h
-#define Composition_h
+#ifndef ServiceWorkerError_h
+#define ServiceWorkerError_h
 
-#include "bindings/v8/ScriptWrappable.h"
+#include "core/dom/DOMError.h"
+#include "public/platform/WebServiceWorkerError.h"
 #include "wtf/PassOwnPtr.h"
-#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class InputMethodContext;
-
-class Composition : public ScriptWrappable {
+class ServiceWorkerError {
 public:
-    static PassOwnPtr<Composition> create(InputMethodContext*);
-    ~Composition();
-
-    void ref();
-    void deref();
-
-    String text() const;
-    int selectionStart() const;
-    int selectionEnd() const;
-    const Vector<unsigned>& getSegments() const;
+    // For CallbackPromiseAdapter
+    typedef WebKit::WebServiceWorkerError WebType;
+    static PassRefPtr<DOMError> from(WebType* webErrorRaw)
+    {
+        OwnPtr<WebType> webError = adoptPtr(webErrorRaw);
+        RefPtr<DOMError> error = DOMError::create(errorString(webError->errorType), webError->message);
+        return error.release();
+    }
 
 private:
-    explicit Composition(InputMethodContext*);
-
-    InputMethodContext* m_inputMethodContext;
+    static String errorString(WebKit::WebServiceWorkerError::ErrorType);
+    WTF_MAKE_NONCOPYABLE(ServiceWorkerError);
+    ServiceWorkerError() WTF_DELETED_FUNCTION;
 };
 
 } // namespace WebCore
 
-#endif // Composition_h
+#endif // ServiceWorkerError_h