Add jessie support to install-build-deps.sh

docs/linux_build_instructions.md

 # Checking out and building Chromium on Linux
 
 There are instructions for other platforms linked from the 
 [get the code](get_the_code.md) page.
 
 ## Instructions for Google Employees
 
 Are you a Google employee? See
 [go/building-chrome](https://goto.google.com/building-chrome) instead.
 
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 For the optional packages on Arch Linux:
 
 *   `php-cgi` is provided with `pacman`
 *   `wdiff` is not in the main repository but `dwdiff` is. You can get `wdiff`
     in AUR/`yaourt`
 *   `sun-java6-fonts` do not seem to be in main repository or AUR.
 
 ### Debian
 
-`build/install-build-deps.sh` doesn't currently run on Debian, but you can
-probably hack it to get it to work. You will probably need to update the
-following package names:
+Some tests require the `ttf-mscorefonts-installer` package from the `contrib`
+component. `contrib` packages may have dependencies on non-free software.
 
-*   `libexpat-dev` → `libexpat1-dev`
-*   `freetype-dev` → `libfreetype6-dev`
-*   `libbzip2-dev` → `libbz2-dev`
-*   `libcupsys2-dev` → `libcups2-dev`
+If you need to run tests requiring MS TTF fonts, you can edit your apt
+`sources.list` by adding `contrib` to the end of each line beginning with `deb`.
+You might end up with something like this:
+
+```
+deb http://ftp.us.debian.org/debian/ jessie main contrib
+deb-src http://ftp.us.debian.org/debian/ jessie main contrib
+
+deb http://security.debian.org/ jessie/updates main contrib
+deb-src http://security.debian.org/ jessie/updates main contrib
+
+# jessie-updates, previously known as 'volatile'
+deb http://ftp.us.debian.org/debian/ jessie-updates main contrib
+deb-src http://ftp.us.debian.org/debian/ jessie-updates main contrib
+```
+
+Next, run:
+
+``` shell
+$ sudo apt-get update
+$ sudo apt-get install ttf-mscorefonts-installer
+```
+
+If you already have the `contrib` component enabled, `install-build-deps.sh`
+will install `ttf-mscorefonts-installer` for you.
 
 ### Fedora
 
 Instead of running `build/install-build-deps.sh`, run:
 
 ```shell
 su -c 'yum install git python bzip2 tar pkgconfig atk-devel alsa-lib-devel \
 bison binutils brlapi-devel bluez-libs-devel bzip2-devel cairo-devel \
 cups-devel dbus-devel dbus-glib-devel expat-devel fontconfig-devel \
 freetype-devel gcc-c++ GConf2-devel glib2-devel glibc.i686 gperf \
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 sudo ln -s /usr/share/fonts/truetype/verdanaz.ttf /usr/share/fonts/truetype/msttcorefonts/Verdana_Bold_Italic.ttf
 ```
 
 And then for the Java fonts:
 
 ```shell
 sudo mkdir -p /usr/share/fonts/truetype/ttf-lucida
 sudo find /usr/lib*/jvm/java-1.6.*-sun-*/jre/lib -iname '*.ttf' -print \
      -exec ln -s {} /usr/share/fonts/truetype/ttf-lucida \;
 ```