crosutils: Add vnc view of tests and running multiple tests for VM tests

lib/cros_vm_lib.sh

Index: lib/cros_vm_lib.sh
diff --git a/lib/cros_vm_lib.sh b/lib/cros_vm_lib.sh
index afa481e8fbdf552ab627512caa63d4a1b45d1e20..7a99cbebe25774791d68a0892780977a8a402f22 100644
--- a/lib/cros_vm_lib.sh
+++ b/lib/cros_vm_lib.sh
@@ -10,6 +10,7 @@ DEFINE_boolean no_graphics ${FLAGS_FALSE} "Runs the KVM instance silently."
 DEFINE_boolean persist "${FLAGS_FALSE}" "Persist vm."
 DEFINE_boolean snapshot ${FLAGS_FALSE} "Don't commit changes to image."
 DEFINE_integer ssh_port 9222 "Port to tunnel ssh traffic over."
+DEFINE_string vnc "" "VNC Server to display to instead of SDL."
 
 KVM_PID_FILE=/tmp/kvm.$$.pid
 LIVE_VM_IMAGE=
@@ -42,6 +43,9 @@ function start_kvm() {
     if [ ${FLAGS_no_graphics} -eq ${FLAGS_TRUE} ]; then
       nographics="-nographic -serial none"
     fi
+    if [ -n "${FLAGS_vnc}" ]; then
+      nographics="-vnc ${FLAGS_vnc}"
+    fi
 
     if [ ${FLAGS_snapshot} -eq ${FLAGS_TRUE} ]; then
       snapshot="-snapshot"