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This CL is boosting the thread priority to avoid loading the DLL at
 background priority.

The following stackframe is the cause of the priority inversion:

  base::win::RoGetActivationFactory
  device::BluetoothAdapterWinrt::PerformSlowInitTasks()
   [...]
  base::internal::WorkerThread::RunWorker()
  base::internal::WorkerThread::RunBackgroundPooledWorker

see: https://bugs.chromium.org/p/chromium/issues/detail?id=973868#c42
Noticed in crash/bc6506f76abf6a60

R=joenotcharles@chromium.org,robliao@chromium.org

Bug: 973868
Change-Id: Ifbe2b87aed7364ad24a59ad300512ef82c03491a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377891Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802021}