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Video swap chain size is zero when scaled overlays are supported, and
contents rect is zero. The earlier fix missed this case.

This CL moves the calculation of swap chain size to DCLayerTree so that
we can skip swap chain creation and other steps which depend on swap
chain size.

A follow-up CL will remove the CHECKs and replace them with UMA where
it makes sense.

Bug: 792806
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: I3de017da44913c9522a0b98c91324efab8148ee6
Reviewed-on: https://chromium-review.googlesource.com/1018499Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552225}