public FromUrl setWindow(final JavaScriptObject window) {
            this.window = window;
            return this;
        }
This call allows you to specify which DOM window object to install
the script tag in. To install into the Top level window call
<p>
<code>
builder.setWindow(ScriptInjector.TOP_WINDOW);
</code>

@param window Specifies which window to install in.
stroom-core-client/src/main/java/stroom/dashboard/client/vis/MyScriptInjector.java