Make ChromeOS build exit nonzero on failure

platform_tools/chromeos/bin/chromeos_make

 #!/bin/bash
 
 # This script builds Skia for ChromeOS by mounting the Skia checkout inside a
 # chroot contained within an existing ChromeOS checkout, entering the chroot,
 # and running the build_skia_in_chroot script.
 
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 if [ $(uname) != "Linux" ]; then
     echo "ERROR: Can only build for ChromeOS on Linux."
@@ skipping 50 matching lines @@
 
 # Put a fake .gclient file in the toolchain directory so that the cros tool
 # thinks we're in a Chrome checkout.
 echo "Delete me!" > "${CHROMEOS_CHROOT}/.gclient"
 
 # Where the Skia code will pretend to live inside the chroot.
 SKIA_TOP_DIR="${SCRIPT_DIR}/../../.."
 
 pushd ${CHROMEOS_CHROOT}
 cros chrome-sdk --nogoma --board ${deviceID} --debug -- /bin/sh -c "cd ${SKIA_TOP_DIR}; platform_tools/chromeos/bin/build_skia_in_chroot ${makeVars}"
-returnVal=$?
 popd > /dev/null
 
 # Clean up
 rm ${CHROMEOS_CHROOT}/.gclient
 
-if [ "${returnVal}" != "0" ]
-then
-  exit 1;
+if [ -f .cros_build_successful ]; then
+  rm -rf .cros_build_successful
+  exit 0
 fi
+
+exit 1