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gwt-jszip (based on jszipgwt by Aki Miyazaki / MIT License)
The newest version!
package com.akjava.gwt.jszip;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.typedarrays.shared.ArrayBuffer;

public class Blob extends JavaScriptObject{

   public static String TYPE_APPLICATION_OCTET_STREM="application/octet-stream";
   
   protected Blob(){}
   
   public   final native double getSize()/*-{
    return this.size;
   }-*/;
   public   final native String getType()/*-{
    return this.type;
   }-*/;
   
   
   public  static final  Blob createBlob(JavaScriptObject object,String type){
   @SuppressWarnings("unchecked")
   JsArray arrays=(JsArray) JsArray.createArray();
   arrays.push(object);
   return createBlob(arrays,type);
   }
   
   public  static final native Blob createBlob(String text,String type)/*-{
    return new $wnd.Blob([text],{type:type});
   }-*/;
   
   public  static final native Blob createBlob(String text)/*-{
    return new $wnd.Blob([text],{type:"text/plain;charset=UTF-8"});
   }-*/;
   
   public  static final native Blob createBlob(JsArray arrays,String type)/*-{
    return new $wnd.Blob(arrays,{type:type});
   }-*/;
   
   public static final Blob createBlob(byte[] bytes){
      Uint8Array array=Uint8Array.createUint8(bytes);
      return createBlob(array, TYPE_APPLICATION_OCTET_STREM);
   }
   
   public  static final native Blob createBlob(ArrayBuffer buffer)/*-{
    return new $wnd.Blob([buffer]);
   }-*/;
   
   public  static final native Blob createBlob(Uint8Array arrays,String type)/*-{
    return new $wnd.Blob([arrays],{type:type});
   }-*/;
   /**
    * support not base64 contain text
    * @param dataURI
    * @param type
    * @return
    */
   public  static final native Blob createBase64Blob(String dataURI,String type)/*-{
    var BASE64_MARKER = ';base64,';
     var index=dataURI.indexOf(BASE64_MARKER);
     var base64Index=0;
     if(index!=-1){
       base64Index=index  + BASE64_MARKER.length
     }
     var base64 = dataURI.substring(base64Index);
     var raw = $wnd.atob(base64);
     var rawLength = raw.length;
     var uInt8Array = new $wnd.Uint8Array(rawLength);
     for (var i = 0; i < rawLength; ++i) {
       uInt8Array[i] = raw.charCodeAt(i);
     }
    return new $wnd.Blob([uInt8Array],{type:type});
   }-*/;
   
   
   

}