extensions/markdown-language-features/src/security.ts/ExtensionContentSecurityPolicyArbiter/setSecurityLevelForResource
class ExtensionContentSecurityPolicyArbiter:	public setSecurityLevelForResource(resource: vscode.Uri, level: MarkdownPreviewSecurityLevel): Thenable<void> {
		return this.globalState.update(this.security_level_key + this.getRoot(resource), level);
	}