tommi 7c3da27141 Add a missing DCHECK to PlatformThread::SetPriority.
This DCHECK is for the 'new and improved' way of setting thread priority.
What could happen is that code that's migrating over to the new method
might still have a lingering SetPriority call, that could incorrectly bind the
'spawned_thread_checker_' to the construction thread.

BUG=none

Review-Url: https://codereview.webrtc.org/2753423002
Cr-Commit-Position: refs/heads/master@{#17305}
2017-03-20 10:47:17 +00:00
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