[Webkit-unassigned] [Bug 172627] New: multiple files(5 files) upload with XMLHttpRequest(high cpu usage when listen to onprogress)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172627

            Bug ID: 172627
           Summary: multiple files(5 files) upload with
                    XMLHttpRequest(high cpu usage when listen to
                    onprogress)
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Windows 7
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: acbrr1985 at 163.com
                CC: webkit-bug-importer at group.apple.com

Here are the code sample:

var _createXDomainRequest = function(){
                var xhr = new XMLHttpRequest(); 
                //xhr.withCredentials = true;
                if(isIE9 && XDomainRequest){
                        xhr = new XDomainRequest();
                }
                return xhr;
        };
var blobSlice = window.File && (File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice) || function(){};

var ajax = _createXDomainRequest();
ajax.onload = function(){};
ajax.onerror = function(){};
if(ajax.upload){
    ajax.upload.onprogress = function (event){} 
}
ajax.open('put', this.rangeData.upload_url, true);
ajax.setRequestHeader("Etag", md5);
ajax.setRequestHeader("Authorization", self.token);
ajax.send(blobSlice.call(self.blobFile, start, (end + 1)));


if i comment /*
if(ajax.upload){
    ajax.upload.onprogress = function (event){} 
}
*/
all the file upload are fine.

but I try to listen to onprogress, which cause high CPU usage.

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