feat(cdk/a11y): fix api goldens

Author: BobobUnicorn

tools/public_api_guard/cdk/a11y.md

@@ -424,6 +424,41 @@ export interface RegisteredMessage {
 // @public
 export function removeAriaReferencedId(el: Element, attr: `aria-${string}`, id: string): void;
 
+// @public
+export class TreeKeyManager<T extends TreeKeyManagerItem> {
+    constructor({ items, skipPredicate, trackBy, horizontalOrientation, activationFollowsFocus, typeAheadDebounceInterval, }: TreeKeyManagerOptions<T>);
+    readonly change: Subject<T | null>;
+    getActiveItem(): T | null;
+    getActiveItemIndex(): number | null;
+    onClick(treeItem: T): void;
+    onKeydown(event: KeyboardEvent): void;
+    readonly tabOut: Subject<void>;
+}
+
+// @public
+export interface TreeKeyManagerItem {
+    activate(): void;
+    collapse(): void;
+    expand(): void;
+    focus(): void;
+    getChildren(): TreeKeyManagerItem[] | Observable<TreeKeyManagerItem[]>;
+    getLabel?(): string;
+    getParent(): TreeKeyManagerItem | null;
+    isDisabled?: (() => boolean) | boolean;
+    isExpanded: (() => boolean) | boolean;
+}
+
+// @public (undocumented)
+export interface TreeKeyManagerOptions<T extends TreeKeyManagerItem> {
+    activationFollowsFocus?: boolean;
+    horizontalOrientation?: 'rtl' | 'ltr';
+    // (undocumented)
+    items: Observable<T[]> | QueryList<T> | T[];
+    skipPredicate?: (item: T) => boolean;
+    trackBy?: (treeItem: T) => unknown;
+    typeAheadDebounceInterval?: true | number;
+}
+
 // (No @packageDocumentation comment for this package)
 
 ```