How can I zoom the game mode viewport to its native scale?

I am working on a game in iPad portrait. My computer monitor is shorter than the iPad so it scales what I’m seeing down a bit and says: Using resolution 645x860 in the top left corner.

Is there a way to zoom the viewport in game mode just like I can in scene mode so I can see it at full size? To be clear, when I build it on the iPad it’s the right size. This is just during in-unity development.

Looks like there is a request for this, but it hasn’t been implemented: http://feedback.unity3d.com/suggestions/simulate-different-dpis-in-editor.

My alternative is to use the scene view with is zoomable.