WKWebView content jumping on load

Question

I've created a simple test app to reproduce my problem reliably and minimize the moving parts. It contains just a navigation controller and a view controller that I add a WKWebView to. I immediately tell that WKWebView to navigate to www.google.ca. Once the page has loaded, the content automatically jumps up underneath the header bar. This is reproducible consistently on various simulators/devices running iOS 8/9/9.1. Below is the code for my ViewController:

//  ViewController.swift
import UIKit
import WebKit

class ViewController: UIViewController {
    let webView = WKWebView()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(webView)
        let url = NSURL(string: "http://www.google.ca")!
        let request = NSURLRequest(URL: url)
        webView.loadRequest(request)
        webView.frame = view.bounds
    }
}

Answer 1

put webView.frame = view.bounds before view.addSubview(webView)