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Methods called in DestroyTask() assume that the input and output queues
have been acquired. However this is only true if Initialize() has been
successfully invoked, which only happens if a V4L2 codec device has been
found. Consequently, the V4L2VDA crashes on every non-V4L2 platform.

Fix this by explicitly checking that the queues have been acquired in
the relevant methods. Also add a few DCHECK() that check our assumptions
about the presence of input and output queues to make the code sturdier.

BUG=890952
TEST=Checked that VDA unittest was passing on Eve and Hana.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ibfa39a85486330c4daa1c0d16c0051796c0011c2
Reviewed-on: https://chromium-review.googlesource.com/1256387
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595723}