Source

File: wp-admin/includes/class-wp-posts-list-table.php

public function column_comments( $post ) {
		?>
		<div class="post-com-count-wrapper">
		<?php
			$pending_comments = isset( $this->comment_pending_count[ $post->ID ] ) ? $this->comment_pending_count[ $post->ID ] : 0;

			$this->comments_bubble( $post->ID, $pending_comments );
		?>
		</div>
		<?php
	}