[Tooltip] Show without delay if another tooltip is showing

[doender]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

The behaviour of tooltips in, for example, Google Docs: there is an initial delay of ~500ms (which we can get with mdTooltipShowDelay), but when a tooltip is shown and the user moves the cursor to another button with a tooltip, that one shows immediately. This behaviour makes sense if the user is 'exploring' the tooltips for a given functionality.

What is the current behavior?

There is always a delay of mdTooltipShowDelay before showing the tooltip.

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[angular-robot]

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