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At V4L2VEA::Destroy(), encoder thread process all the pending tasks. If
PumpBitstreamBuffers() is in the pending tasks, Enqueue() is posted and
processed after DestroyTask(). That leads |input_queue_| and |output_queue_| are
nullptr and causes SIGSEGV.

This fixes the issue by posting tasks to encoder_thread_.task_runner() with
WeakPtr of this. This makes V4L2VEA not execute any tasks posted to the task
runner after DestroyTask() because the WeakPtr is invalidated in DestroyTask().

Bug: 1019437
Test: VEA unittest on guado with dcheck_always_on=true
Change-Id: Ie2e43d1dd9c74114cbd0d2b51e260213b60136e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890462
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711148}