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This changelist also refactors the FileEnumWorkerTask to
facilitate easier testing. Functions createImageCursor and
shouldShowCameraTile were added so that that behavior could be
overridden during testing. Also, onCancelled was added so
that the test would get notified when the thread has to be
shut down due to an Exception being thrown (otherwise the
Roboelectric test just hangs).

Bug: 656015
Change-Id: Ie601a84c6e8028a57720ddaf9802eecd194c4f4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127708
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Auto-Submit: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756316}