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We have set coded_size to (E)GLImage. It causes that a green line
is shown at the bottom and right edge when playing a video.

The correct set size is visible size so that GPU doesn't access
non-visible area on compositing.

Bug: 1043582
Test: Play a 1080p video on soraka
Change-Id: Ide3008bf602be3a4e189af1f6ab18213fca74753
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011583
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733868}