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Some devices select the video decoder implementation by the video
configuration (e.g. codec). VideoDecoderPipeline needs to select a
proper video decoder in Initialize() when a video configuration is
specified.

This CL implements the mechanism of selecting VD at Initialize()
instead of Create() method.

BUG=chromium:952730
TEST=Run video_decode_accelerator_tests on Kevin and Eve

Change-Id: I76077df0bc1e1eeae730e618a62c6e1049e02500
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708693Reviewed-by: David Staessens <dstaessens@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691946}