Including javascript in editor-content context

[Boris]

I added a web resource that contains a JS file. Target context is editor-content, which judging by the docs should include it in the editor iframe.

But nothing happens. JS is completely ignored.

<web-resource name="editor frame" key="editor-frame">
 <context>editor-content</context>
 <resource type="download" name="some.js" location="js/some.js" >
 </resource>
 </web-resource>

Any clues?