public void resumeRequestsRecursive() {
        Util.assertMainThread();
        resumeRequests();
        for (RequestManager requestManager : treeNode.getDescendants()) {
            requestManager.resumeRequests();
        }
    }
Performs {@link #resumeRequests()} recursively for all managers that are contextually descendant
to this manager based on the Activity/Fragment hierarchy. The hierarchical semantics are identical as for
{@link #pauseRequestsRecursive()}.
core/src/main/java/com/bumptech/glide/RequestManager.java