You must set your Windows system locale to English, or else you may get build errors about “The file contains a character that cannot be represented in the current code page.”
You must build with Visual Studio 2013 Update 4 or Visual Studio 2015 Update 1, no other versions are supported.
You must have Windows 7 x64 or later. x86 OSs are unsupported.
For building with Visual Studio 2015 (default compiler as of March 10, 2016):
Install Visual Studio 2015 Update 1 or later - Community Edition should work if its license is appropriate for you. Be sure to select Custom install and select VC++ (which selects three sub-categories including MFC) and, under Universal Windows App Development Tools, select Tools (1.2) and Windows 10 SDK (10.0.10586). You must have the 10586 SDK installed or else you will hit compile errors such as redefined macros.
For building with Visual Studio 2013 (no longer default as of March 10, 2016, and not recommended - requires setting GYP_MSVS_VERSION=2013):
Install Visual Studio 2013 Community or Visual Studio 2013 Professional depending on which license is appropriate for you. You can deselect the default options if you want, but you must make sure to install “Microsoft Foundation Classes for C++”.
You should also install the Windows 10 SDK to the default install location. You must have SDK version 10.0.10586 or greater installed.
set DEPOT\_TOOLS\_WIN\_TOOLCHAIN=0, or set that variable in your global environment.
Visual Studio Express 2013 is not supported and will not be able to build Chromium.
Compilation is done through ninja, not Visual Studio.
download\_from\_google\_storage --config and follow the authentication instructions.Note that you must authenticate with your @google.com credentials, not @chromium.org. Enter “0” if asked for a project-id.
Once you've done this, the toolchain will be installed automatically for you in Step 3, below (near the end of the step).
The toolchain will be in depot_tools\win_toolchain, and windbg can be found in depot_tools\win_toolchain\vs2013_files\win8sdk\Debuggers.
If you want the IDE for debugging and editing, you will need to install it separately, but this is optional and not needed to build Chromium.
Follow the steps to check out the code (largely “fetch chromium”).
Build the target you are interested in.
ninja -C out\\Debug chrome
Alternative (Graphical user interface): Open a generated .sln file such as all.sln, right-click the chrome project and select build. This will invoke the real step 4 above. Do not build the whole solution since that conflicts with ninja's build management and everything will explode. Substitute the build directory given to -C with out\Debug_x64 for 64-bit builds in GYP, or whatever build directory you have configured if using GN.
Still expect build times of 30 minutes to 2 hours when everything has to be recompiled.