Add WooCommerce Product ID To Checkout

gistfile1.phtml

			<tr class="cart-subtotal">
				<th colspan="2"><strong><?php _e('WordPress Theme Product ID', 'woocommerce'); ?></strong></th>
				<?php 
					foreach ($woocommerce->cart->get_cart() as $item_id => $values) :
					$_product = $values['data'];
				?>			
				<td><?php echo $_product->id; ?></td>
				<?php endforeach; ?>
			</tr>