Menu button should be to the left of the page title

[smartapant]

Now its position is unpredictable since it depends on the length of the page title. Text should never be able to displace and change to position of your app's principle navigation button.
Placing it after the title puts it further from the edge of the screen, which makes clicking it in mobile devices harder.
On mobile it's practically right aligned, but it opens a menu on the left, which makes no sense cognitively speaking because it's not connected to that side of the screen in any way.
And finally, because the Material Design spec says so:
https://www.google.com/design/spec/layout/structure.html#structure-app-bar