src/vs/workbench/browser/parts/editor/editorPart.ts/EditorPart/doLayout
class EditorPart:	private doLayout(dimension: Dimension, top = this._top, left = this._left): void {
		this._contentDimension = dimension;

		// Layout Grid
		this.centeredLayoutWidget.layout(this._contentDimension.width, this._contentDimension.height, top, left);

		// Event
		this._onDidLayout.fire(dimension);
	}