For gclient syncing repos from googlesource.com. Install depot_tools, and run `gclient sync` from a directory with this .gclient file.

.gclient

solutions = [
  {
    "name": "chromium",
    "url": "https://chromium.googlesource.com/chromium/src.git",
    "managed": False,
    "custom_deps": {},
    "custom_vars": {},
  },
  { "name"        : 'libyuv',
    "url"         : 'https://chromium.googlesource.com/libyuv/libyuv',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
  { "name"        : 'webrtc',
    "url"         : 'https://webrtc.googlesource.com/src',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
  { "name"        : 'libvpx',
    "url"         : 'https://chromium.googlesource.com/webm/libvpx',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
  { "name"        : 'libwebp',
    "url"         : 'https://chromium.googlesource.com/webm/libwebp',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
  { "name"        : 'skia',
    "url"         : 'https://chromium.googlesource.com/skia',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
  { "name"        : 'libwebm',
    "url"         : 'https://chromium.googlesource.com/webm/libwebm',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
  { "name"        : 'v8',
    "url"         : 'https://chromium.googlesource.com/v8/v8',
    "deps_file"   : 'DEPS',
    "managed"     : True,
    "custom_deps" : {
    },
    "custom_vars": {},
  },
]