Chromium base

Install depot_tools

Install depot_tools here

Setting up Windows

Visual Studio

Install Visual Studio 2019 (>=16.0.0)
Install Windows 10 SDK

Setting up Mac OS

A Mac, Intel or Arm. (More details about Arm Macs.)
Xcode. Xcode comes with...
The macOS SDK. Run

command:

gclient config --unmanaged --name=src https://github.com/LittleKu/base.git

gclient sync

cd src

set NINJA_SUMMARIZE_BUILD=1

# MacOS:
gn gen out/Debug --filters://base "--args=is_debug=true target_os=\"mac\"" --ide=xcode
autoninja -C out/Debug default

# Windows:
gn gen out/Debug_x86 --filters://base "--args=is_debug=true target_os=\"win\" target_cpu=\"x86\"" --ide=vs2019
autoninja -C out/Debug_x86 default