Import Cobalt.21.master.0.282262

Includes the following patches:
  https://cobalt-review.googlesource.com/c/cobalt/+/5810
    by rongo.li@mstar.corp-partner.google.com
diff --git a/src/docker/linux/android/Dockerfile b/src/docker/linux/android/Dockerfile
index d76e0ce..ad34732 100644
--- a/src/docker/linux/android/Dockerfile
+++ b/src/docker/linux/android/Dockerfile
@@ -16,6 +16,8 @@
     && rm -rf /var/lib/{apt,dpkg,cache,log} \
     && echo "Done"
 
+RUN mkdir -p /root/.android
+
 CMD (test -f /root/.android/debug.keystore \
     && echo "Android debug keystore exists." \
     || (keytool -genkey -v \