Window access on secure DOM (LockerService)

We've identified the issue within LockerService and it's in our queue to fix.

Please open a case with support and tell them to link to our internal work item W-3198557.

Just a thought on approaching this from a different angle: Remember that Locker will bar you from seeing DOM elements outside your Lightning namespace, but your components can still see one another.

There is a way to set dimensions relative to the height or width of the viewport in pure CSS using the vh and vw units. For example if your top-level component has this CSS:

.THIS {
    height: 90vh;
}

Then it means the element will size up to 90% of the available viewport. I can't be confident right now of expected results but at least in theory you can query that top-level component's height (whether through the DOM or events) and use it to trigger changes in other components' sizes.