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A display transform pass could be added during capturing when
devices are not in their default orientation. Making the display
transform pass to copy |has_transparent_background| flag from
root renderer pass fixed the problem on Dru. Without the flag
copied, Dru (ARM/Mali) somehow shows the display transform pass
as a black frame and causes the flicker.

Bug: 1041901
Change-Id: I9651073cf8f9ab75ae5aaf6bfcd20a25fd4349d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089957
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747465}