Add /dev/stdin am: 471e7f664c

Original change: https://android-review.googlesource.com/c/platform/tools/treble/+/2411185

Change-Id: Ice7c3920ab2927946c8667b4e5ad38a4c4c9c679
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/build/sandbox/nsjail.cfg b/build/sandbox/nsjail.cfg
index 509ecc6..5341577 100644
--- a/build/sandbox/nsjail.cfg
+++ b/build/sandbox/nsjail.cfg
@@ -154,3 +154,10 @@
   dst: "/dev/zero"
   is_bind: true
 }
+
+# /dev/stdin used during the creation files in external/cronet
+mount {
+  src: "/proc/self/fd/0"
+  dst: "/dev/stdin"
+  is_symlink: true
+}