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DisplayConfigurator serializes asynchronous content protection requests
by storing pending query/apply tasks as closures in a queue. It also
maintains queues for the query/apply callbacks supplied by the client.

This CL consolidates the queues by relating QueryContentProtectionTask
and ApplyContentProtectionTask by a common base class. It also replaces
the Boolean for task success/failure with tri-state, whose extra bit is
used to distinguish killed tasks during DisplayConfigurator destruction
and (in a future CL) display reconfiguration.

Bug: 929449
Test: display_unittests
Change-Id: I3640b657ed5952c40e0999836ae92287984a3e9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1495201Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Dominik Laskowski <domlaskowski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649234}