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Originally, V4L2StatefulVDBackend skipped flush when the V4L2 output
queue is not streaming. However, it doesn't mean there is no pending
requests needed to be flushed. This CL fixes this issue by introduing
a new flag to track if there is any pending request.

BUG=b:170728773
TEST=android.media.cts.AdaptivePlaybackTest#testH264_adaptiveReconfigDrc
TEST=tast.video.DecodeAccel.{h264,vp8,vp9}

Change-Id: I45d2b6072e47f23a3a61ccb622bef206ad1bb6e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532027
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827678}