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When using import mode, we used to assign output_fds last, during
the call to AssignEGLImage(). However this can also be done ahead of
time in ImportBufferForPictureTask(). Doing so allows us to stop passing
the DMABUF FDs as an argument to AssignEGLImage(), simplifying its
interface as well as the code in ImportBufferForPictureTask().

BUG=792790
TEST=Checked that VDA unittest was passing on Hana, in import and
non-import mode, with rendering enabled or not.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I95b66f7b3b4ee31147b2eb34a19499c39ad4efa8
Reviewed-on: https://chromium-review.googlesource.com/c/1288497Reviewed-by: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601882}