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This CL s/const/constexpr/ in a few locations in vaapi/ folder.
No new code intended, just that substitution.

TBR=dcastagna@chromium.org

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: I4ec733806feff58a70e8e9ab1c0d7f4565f1733c
Reviewed-on: https://chromium-review.googlesource.com/1012949
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551403}