src/vs/workbench/browser/parts/editor/editorAutoSave.ts/EditorAutoSave/onDidChangeContent
class EditorAutoSave:	private onDidChangeContent(workingCopy: IWorkingCopy): void {
		if (workingCopy.isDirty()) {
			// this listener will make sure that the auto save is
			// pushed out for as long as the user is still changing
			// the content of the working copy.
			this.scheduleAutoSave(workingCopy);
		}
	}