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The V4L2 device members are currently accessed in the GL/EGL image
creation method, which runs on the child thread. But these members
belong to the decoder thread and are not thread-safe.

Fix this by passing the device used to create the GL/EGL image to the
creation method. That way the member is accessed from the decoder
thread, and the only thing that happens in the child thread is the call
to V4L2Device::Create(E)GLImage, which is supposed to take place there.

BUG=None
TEST=video.Seek.switch_vp8 passing on Kevin.
TEST=video.Seek.switch_vp8 passing on Hana.
TEST=video.Seek.switch_h264 passing on Krane.

Change-Id: Ie94745c1215989db77e85896ac1fda69cf43a080
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026853
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739388}