Turning on multidex for cast_shell_apk

TBR=sanfin

Bug: 940888
Change-Id: I272ba32704f847a20cf93d8401ec277dc7932326
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518333
Commit-Queue: Sam Maier <smaier@chromium.org>
Auto-Submit: Sam Maier <smaier@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639940}
1 file changed