sudo apt-get install git libasound-dev libspeexdsp-dev libgtest-dev libtool automake libdbus-1-dev libudev-dev g++ ladspa-sdk

install libsbc 1.1 manually by downloading and compiling the tarball from http://www.bluez.org/ (I couldn't find an package for Precise).

ini parser.

git clone https://github.com/ndevilla/iniparser.git
cd iniparser
make
sudo cp libiniparser.* /usr/local/lib
sudo cp src/dictionary.h src/iniparser.h /usr/local/include
sudo chmod 644 /usr/local/include/dictionary.h /usr/local/include/iniparser.h
sudo chmod 644 /usr/local/lib/libiniparser.a
sudo chmod 755 /usr/local/lib/libiniparser.so.0

gtest.

cd /usr/src/gtest
sudo apt-get install cmake
sudo cmake .
sudo make
sudo chmod 644 *.a
sudo cp *.a /usr/local/lib

Build/install cras.

git clone https://git.chromium.org/git/chromiumos/third_party/adhd
cd adhd/cras
./git_prepare.sh
./configure --prefix=/usr
make -j33
sudo make install

mkdir /var/run/cras

Confiugre/build Chrome.

Follow instruction on wiki for getting and building chrome.

cd chromium/src

GYP_GENERATORS="ninja" ./build/gyp_chromium -Duse_cras=1

ninja -C out/Release chrome

Start cras and chrome.

cd adhd/cras

src/cras

cd chromium/src

./out/Release/chrome --use-cras