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This cl creates the windows platform for ozone.

These changes are not sufficient for a successful Windows/Ozone build.
See: https://chromium-review.googlesource.com/c/chromium/src/+/974285
and https://swiftshader-review.googlesource.com/c/SwiftShader/+/17968

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: If27cd7b56d5503db6881cf1f2c563826f72f0be0
Reviewed-on: https://chromium-review.googlesource.com/975902Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Mustafa Çamurcu <camurcu@google.com>
Cr-Commit-Position: refs/heads/master@{#553300}