Make errors and warnings a bit more obvious.

src/scripts/common.sh

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Common constants for build scripts
 # This must evaluate properly for both /bin/bash and /bin/sh
 
 # All scripts should die on error unless commands are specifically excepted
 # by prefixing with '!' or surrounded by 'set +e' / 'set -e'.
 # TODO: Re-enable this once shflags is less prone to dying.
@@ skipping 262 matching lines @@
   if [[ $# -gt 0 ]]; then
     echo "error: invalid arguments: \"$@\"" >&2
     flags_help
     exit 1
   fi
   return $do_shift
 }
 
 V_RED="\e[31m"
 V_YELLOW="\e[33m"
+V_BOLD_RED="\e[1;31m"
+V_BOLD_YELLOW="\e[1;33m"
 
 function warn {
-  echo -e "${V_YELLOW}Warning..: $1${V_VIDOFF}"
+  echo -e "${V_BOLD_YELLOW}WARNING: $1${V_VIDOFF}"
 }
 
 function error {
-  echo -e "${V_RED}Error....: $1${V_VIDOFF}"
+  echo -e    "${V_BOLD_RED}ERROR  : $1${V_VIDOFF}"
 }
 
 function die {
   error "$1"
   exit 1
 }