tommi f9d9154808 Add support for multimedia timers to TaskQueue on Windows.
Multimedia timers are higher precision than WM_TIMER, but they're also
a limited resource and more costly. So this implementation is a best
effort implementation that falls back on WM_TIMER when multimedia
timers aren't available.

A possible future change could be to make high precision timers in a
TaskQueue, optional. The reason for doing so would be for TaskQueues
that don't need high precision timers, won't eat up timers from TQ
instances that really need it.

BUG=webrtc:7151

Review-Url: https://codereview.webrtc.org/2691973002
Cr-Commit-Position: refs/heads/master@{#16661}
2017-02-17 10:47:11 +00:00
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