JsObject(HTMLDocument) not converted to HtmlDocument

[DartBot]

This issue was originally filed by @DisDis

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My chrome extension contains:
background.html
page1.html

background page registers javascript function "Page1.init"(pageDoc):
js.context["Page1"] = new js.JsObject.jsify({
    "init": (param1,param2,param3) {
       print("Page1.init($param1 ${param1.runtimeType})");
        new UIPage1(param1);
    }
 });

page1 - get background window (used chrome.runtime.getBackgroundPage) and execute bw.Page1.init(document).
function initPage(){
  chrome.runtime.getBackgroundPage(function(bw){
   bw.Page1.init(document);
  });
}

Real background log:
Page1.init([object HTMLDocument] JsObject)

Expect:
Page1.init(Instance of 'HtmlDocument' HtmlDocument)

Sample extension source code:
https://github.com/DisDis/JsOToHtmlDoc

[peter-ahe-google]

Added Area-Library, Library-JS, Triaged labels.

[DartBot]

This comment was originally written by dev...@futureperfect.info

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This looks to me like another instance of:
https://code.google.com/p/dart/issues/detail?id=15053

Any of the white-listed types coming from the background script in Chrome Apps or Extensions arrive as JsObject proxies due to this language interop security nonsense. Language interop and security are two disjointed concepts.

[justinfagnani]

Added Duplicate label.
Marked as being merged into #15053.