feat(viewport-ruler): add common window resize handler

[crisbeto]

Adds the change method to the ViewportRuler, allowing for components to hook up to a common window resize handler.

BREAKING CHANGE: Previously the ScrollDispatcher.scrolled subscription would react both on scroll events and on window resize events. Now it only reacts to scroll events. To react to resize events, subscribe to the ViewportRuler.change() stream.

This is a re-submit of #7055.

[mmalerba]

@crisbeto I'm seeing a screenshot test failure where the select's popup winds up misaligned. (I'm assuming due to a window resize in the test and the fact that RepositionScrollStrategy no longer listens for those resize events). This seems like it may be a bigger problem than just the select, all of our popup style components are probably relying on this right now.

[crisbeto]

I see. I don't think that the resize logic belonged in the scroll strategy in the first place, but I can re-add it in the overlayRef.

[crisbeto]

@mmalerba I've re-added the resize listener for connected overlays.

[andrewseguin]

Needs rebase

[kara]

@crisbeto Can you fix the linter error when you get a chance?

[crisbeto]

Sorted out the linting issue.

[kara]

Gah! Another conflict, sorry @crisbeto

[crisbeto]

Rebased.

[kara]

@crisbeto Check out the test failures? Probably rebase problem?

[crisbeto]

Seems like something that got introduced from master. Fixed.

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