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The FuchsiaCdmManager needs to create directories for each origin to
pass to the platform CDM services to fulfill EME origin isolation
requirements. The FuchsiaCdmManager runs on the main thread and the
calls to CreateDirectoryAndGetError are potentially blocking. This CL
moves the directory creation step to a background task.

This is a reland of crrev.com/c/2500532. Since directory creation was
pushed to the threadpool, the order in which CDM requests are processed
is no longer certain. A couple of the tests were using the error handler
on a particular ContentDecryptionModulePtr to determine when to
terminate the RunLoop. The quit condition now requires all
ContentDecryptionModulePtrs to have their error handlers fired.

Bug: 1140655
Change-Id: Ie28885c1736861a1bba66acd3e9aa6f26f1208bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508031
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822958}