While enabling ARM64 builds for Chrome OS, the builds are failing because of missing quickoffice files.

Traceback (most recent call last):   
  File "/usr/lib/portage/python2.7/doins.py", line 584, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/usr/lib/portage/python2.7/doins.py", line 575, in main      
    os.path.dirname(source)):
  File "/usr/lib/portage/python2.7/doins.py", line 423, in _doins
    return install_runner.install_file(source, os.path.dirname(dest))
  File "/usr/lib/portage/python2.7/doins.py", line 359, in install_file
    return self._ins_runner.run(source, dest_dir)
  File "/usr/lib/portage/python2.7/doins.py", line 167, in run
    if not self._is_install_allowed(source, dest):
  File "/usr/lib/portage/python2.7/doins.py", line 214, in _is_install_allowed
    source_stat = os.stat(source)
OSError: [Errno 2] No such file or directory: '/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/chrome/browser/resources/chromeos/quickoffice/_platform_specific/arm64'
 * ERROR: chromeos-base/chromeos-chrome-70.0.3538.0_rc-r1::chromiumos failed (install phase):
 *   doins failed