Mount /run and /run/shm in chroots.

When running layout tests, we need /run/shm.  Previously we wouldn't
install it because the chroot didn't have /run.  Now we will mount
/run and /run/shm in the chroot.

BUG=166632


Review URL: https://chromiumcodereview.appspot.com/11649050

git-svn-id: http://src.chromium.org/svn/trunk/src/build@174326 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

install-chroot.sh

@@ -392,12 +392,16 @@ if [ -d /media ] &&
     sudo sh -c 'cat >>/etc/schroot/mount-'"${target}"
 fi
 
-# Share /dev/shm and possibly /run/shm
+# Share /dev/shm, /run and /run/shm.
 grep -qs '^/dev/shm' /etc/schroot/mount-"${target}" ||
   echo '/dev/shm /dev/shm none rw,bind 0 0' |
     sudo sh -c 'cat >>/etc/schroot/mount-'"${target}"
-if [ -d "/var/lib/chroot/${target}/run" ] &&
-   ! grep -qs '^/run/shm' /etc/schroot/mount-"${target}"; then
+if [ ! -d "/var/lib/chroot/${target}/run" ] &&
+   ! grep -qs '^/run' /etc/schroot/mount-"${target}"; then
+  echo '/run /run none rw,bind 0 0' |
+    sudo sh -c 'cat >>/etc/schroot/mount-'"${target}"
+fi
+if ! grep -qs '^/run/shm' /etc/schroot/mount-"${target}"; then
   { [ -d /run ] && echo '/run/shm /run/shm none rw,bind 0 0' ||
                    echo '/dev/shm /run/shm none rw,bind 0 0'; } |
     sudo sh -c 'cat >>/etc/schroot/mount-'"${target}"