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VideoFrameLayout should have information about offset per plane, not only
stride. The number of stride should be the same as the number of offsets. To
guarantee this, they are stored in the vector of struct, Plane.

BUG=chromium:876986, chromium:856562
TEST=VDA unittest and media_unittest

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: Ie9d9afa5db7dabaee2f48fbcd355c13d29be8035
Reviewed-on: https://chromium-review.googlesource.com/1188730
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590242}