Update linux build dependency script.

build/install-build-deps.sh

 #!/bin/bash -e
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to install everything needed to build chromium (well, ideally, anyway)
 # See http://code.google.com/p/chromium/wiki/LinuxBuildInstructions
 # and http://code.google.com/p/chromium/wiki/LinuxBuild64Bit
 
@@ skipping 71 matching lines @@
           language-pack-fr libapache2-mod-php5 libasound2-dev libbrlapi-dev
           libbz2-dev libcairo2-dev libcups2-dev libcurl4-gnutls-dev libelf-dev
           libgconf2-dev libgl1-mesa-dev libglib2.0-dev libglu1-mesa-dev
           libgnome-keyring-dev libgtk2.0-dev libkrb5-dev libnspr4-dev
           libnss3-dev libpam0g-dev libpci-dev libpulse-dev libsctp-dev
           libspeechd-dev libsqlite3-dev libssl-dev libudev-dev libwww-perl
           libxslt1-dev libxss-dev libxt-dev libxtst-dev mesa-common-dev
           openbox patch perl php5-cgi pkg-config python python-cherrypy3
           python-dev python-psutil rpm ruby subversion ttf-dejavu-core
           ttf-indic-fonts ttf-kochi-gothic ttf-kochi-mincho ttf-thai-tlwg
-          wdiff git-core
+          wdiff git-core libdrm-dev
           $chromeos_dev_list"
 
 # 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
 # NaCl binaries. These are always needed, regardless of whether or not we want
 # the full 32-bit "cross-compile" support (--lib32).
 if [ "$(uname -m)" = "x86_64" ]; then
   dev_list="${dev_list} libc6-i386 lib32gcc1 lib32stdc++6"
 fi
 
 # Run-time libraries required by chromeos only
@@ skipping 409 matching lines @@
              sed -e 's/[.]so[.][0-9].*/.so/' |
              sort -u); do
     [ "x${i##*/}" = "xld-linux.so" ] && continue
     [ -r "$i" ] && continue
     j="$(ls "$i."* | sed -e 's/.*[.]so[.]\([^.]*\)$/\1/;t;d' |
          sort -n | tail -n 1)"
     [ -r "$i.$j" ] || continue
     sudo ln -s "${i##*/}.$j" "$i"
   done
 fi