Add libav-tools to install-build-deps.sh.

build/install-build-deps.sh

Index: build/install-build-deps.sh
diff --git a/build/install-build-deps.sh b/build/install-build-deps.sh
index a0fcbd409b1b0e281c69b85dc1d9b696aaa89431..384165c19ef7db5179c36314221241c5b514707b 100755
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -97,17 +97,17 @@ chromeos_dev_list="libbluetooth-dev"
 dev_list="apache2.2-bin bison curl dpkg-dev elfutils devscripts fakeroot flex
           fonts-thai-tlwg g++ git-core gperf language-pack-da language-pack-fr
           language-pack-he language-pack-zh-hant libapache2-mod-php5
-          libasound2-dev libbrlapi-dev libbz2-dev libcairo2-dev libcap-dev
-          libcups2-dev libcurl4-gnutls-dev libdrm-dev libelf-dev libexif-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 wdiff xfonts-mathml zip
-          $chromeos_dev_list"
+          libasound2-dev libbrlapi-dev libav-tools libbz2-dev libcairo2-dev
+          libcap-dev libcups2-dev libcurl4-gnutls-dev libdrm-dev libelf-dev
+          libexif-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
+          wdiff xfonts-mathml zip $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