ozone: scenic: Enable SwiftShader

Parts of chromium still depend on a GLES implementation, even when vulkan
is in use. To avoid crashes related to those components, enable
swiftshader temporarily.

Bug: 861853, 897208
Test: run_content_shell --ozone-platform=scenic --disable-gpu --enable-vulkan

Change-Id: I87453e066de39f188a8db28079d80f058fcc4e1c
Reviewed-on: https://chromium-review.googlesource.com/c/1343240
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609461}
2 files changed