deploy_chrome: copy swiftshader

It is necessary to copy swiftshader path as well to enable headless
ozone platform on Chrome OS devices.

BUG=b:160309778
TEST=manual

Change-Id: I1a294b65343853b56d9748bb318e737debfec40a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2277731
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
Tested-by: Polina Bondarenko <pbond@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
diff --git a/lib/chrome_util.py b/lib/chrome_util.py
index d706e6f..6fe8bc5 100644
--- a/lib/chrome_util.py
+++ b/lib/chrome_util.py
@@ -413,6 +413,7 @@
     Path('Packages/content_browser/manifest.json', optional=True),
     Path('resources/chromeos/'),
     Path('resources.pak'),
+    Path('swiftshader/', optional=True),
     Path('xdg-settings'),
     Path('*.png'),
 ) + _COPY_PATHS_COMMON