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1. If HW overlay scaling is supported, set swap chain size to the minimum of the decoded
video buffer size and the onscreen video size.
2. If HW overlay scaling is not supported, set swap chain size to onscreen video size.

This CL removes overlay down scaling, and therefore fixes no hardware overlays due to
down scaling not working on Intel display HW.

BUG=868561

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: I251ddb4f5e24807dd7267eca38180cae241fb6f6
Reviewed-on: https://chromium-review.googlesource.com/1225295
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594159}