1. You'll need to have the depot tools installed:
2. You need git installed (needed for getting WebM source):
This, and more, is described on the Chromium site:
A script is provided for Ubuntu, which is available after your first gclient sync:
Pulse Audio is missing from the script. On Ubuntu, this is provided by the libpulse-dev package.
Although the install-build-deps.sh script is the recommended method, it will install much more than you need. Here is a (hopefully complete) minimal list of packages to install (sudo apt-get install...):
g++ (>= 4.2)
python (>= 2.4)
libnss3-dev >= 3.12
For 32-bit builds on a 64-bit system:
Tips for other distributions are available on the Chromium page.
Follow step 1 in Chromium's build instructions: http://www.chromium.org/developers/how-tos/build-instructions-windows
XCode 3.0 or higher
These instructions are tested on a Linux development machine.
In WebRTC, we're using the same Android toolchain as Chrome (the one that is downloaded into third_party/android_tools if you follow AndroidBuildInstructions). So you don't need to install NDK/SDK separately.