VirtualRenderer = function(container, theme) {
    var _self = this;

    this.container = container;

    // TODO: this breaks rendering in Cloud9 with multiple ace instances
//    // Imports CSS once per DOM document ('ace_editor' serves as an identifier).
//    dom.importCssString(editorCss, "ace_editor", container.ownerDocument);

    // in IE <= 9 the native cursor always shines through
    this.$keepTextAreaAtCursor = !useragent.isIE;

    dom.addCssClass(container, "ace_editor");

    this.setTheme(theme);

    this.$gutter = dom.createElement("div");
    this.$gutter.className = "ace_gutter";
    this.container.appendChild(this.$gutter);

    this.scroller = dom.createElement("div");
    this.scroller.className = "ace_scroller";
    this.container.appendChild(this.scroller);

    this.content = dom.createElement("div");
    this.content.className = "ace_content";
    this.scroller.appendChild(this.content);

    this.$gutterLayer = new GutterLayer(this.$gutter);
    this.$gutterLayer.on("changeGutterWidth", this.onResize.bind(this, true));
    this.setFadeFoldWidgets(true);

    this.$markerBack = new MarkerLayer(this.content);

    var textLayer = this.$textLayer = new TextLayer(this.content);
    this.canvas = textLayer.element;

    this.$markerFront = new MarkerLayer(this.content);

    this.characterWidth = textLayer.getCharacterWidth();
    this.lineHeight = textLayer.getLineHeight();

    this.$cursorLayer = new CursorLayer(this.content);
    this.$cursorPadding = 8;

    // Indicates whether the horizontal scrollbar is visible
    this.$horizScroll = false;
    this.$horizScrollAlwaysVisible = false;

    this.$animatedScroll = false;

    this.scrollBar = new ScrollBar(container);
    this.scrollBar.addEventListener("scroll", function(e) {
        if (!_self.$inScrollAnimation)
            _self.session.setScrollTop(e.data);
    });

    this.scrollTop = 0;
    this.scrollLeft = 0;

    event.addListener(this.scroller, "scroll", function() {
        var scrollLeft = _self.scroller.scrollLeft;
        _self.scrollLeft = scrollLeft;
        _self.session.setScrollLeft(scrollLeft);
    });

    this.cursorPos = {
        row : 0,
        column : 0
    };

    this.$textLayer.addEventListener("changeCharacterSize", function() {
        _self.characterWidth = textLayer.getCharacterWidth();
        _self.lineHeight = textLayer.getLineHeight();
        _self.$updatePrintMargin();
        _self.onResize(true);

        _self.$loop.schedule(_self.CHANGE_FULL);
    });

    this.$size = {
        width: 0,
        height: 0,
        scrollerHeight: 0,
        scrollerWidth: 0
    };

    this.layerConfig = {
        width : 1,
        padding : 0,
        firstRow : 0,
        firstRowScreen: 0,
        lastRow : 0,
        lineHeight : 1,
        characterWidth : 1,
        minHeight : 1,
        maxHeight : 1,
        offset : 0,
        height : 1
    };

    this.$loop = new RenderLoop(
        this.$renderChanges.bind(this),
        this.container.ownerDocument.defaultView
    );
    this.$loop.schedule(this.CHANGE_FULL);

    this.setPadding(4);
    this.$updatePrintMargin();
}
new VirtualRenderer(container, theme)
- container (DOMElement): The root element of the editor
- theme (String): The starting theme

Constructs a new `VirtualRenderer` within the `container` specified, applying the given `theme`.