Add testPartialUpdate, testCorruptedUpdate.

bin/cros_run_vm_update

Index: bin/cros_run_vm_update
diff --git a/bin/cros_run_vm_update b/bin/cros_run_vm_update
index 0af8fb3a3e2331172ab98b4e63fd672f561af15c..abd00714622e61a6c076927e6c71fb8712e0499d 100755
--- a/bin/cros_run_vm_update
+++ b/bin/cros_run_vm_update
@@ -9,6 +9,7 @@
 . "$(dirname $0)/../common.sh"
 . "$(dirname $0)/../lib/cros_vm_lib.sh"
 
+DEFINE_string payload "" "Full name of the payload to update with."
 DEFINE_string src_image "" \
   "Create a delta update by passing in the image on the remote machine."
 DEFINE_string stateful_update_flag "" "Flags to pass to stateful update." s
@@ -21,7 +22,7 @@ set -e
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
-[ -n "${FLAGS_update_image_path}" ] || \
+[ -n "${FLAGS_update_image_path}" ] || [ -n "${FLAGS_payload}" ] || \
   die "You must specify a path to an image to use as an update."
 [ -n "${FLAGS_vm_image_path}" ] || \
   die "You must specify a path to a vm image."
@@ -29,6 +30,14 @@ eval set -- "${FLAGS_ARGV}"
 trap stop_kvm EXIT
 start_kvm "${FLAGS_vm_image_path}"
 
+if [ -n "${FLAGS_update_image_path}" ]; then
+  IMAGE_ARGS="--image=$(readlink -f ${FLAGS_update_image_path})"
+fi
+
+if [ -n "${FLAGS_payload}" ]; then
+  IMAGE_ARGS="--payload="${FLAGS_payload}""
+fi
+
 $(dirname $0)/../image_to_live.sh \
   --remote=127.0.0.1 \
   --ssh_port=${FLAGS_ssh_port} \
@@ -36,5 +45,5 @@ $(dirname $0)/../image_to_live.sh \
   --src_image="${FLAGS_src_image}" \
   --verify \
   --for_vm \
-  --image=$(readlink -f ${FLAGS_update_image_path})
+  ${IMAGE_ARGS}