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As described in the linked bug, loading DLL on a background thread may
cause a priority inversion on the loader lock. It is a common source of
jank in Chrome.

Bug: 973868
Change-Id: Ic375b0b4e94cca763f7c48ebb3c231ac5a1223a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071960Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744526}