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diff --git a/chromium/build/toolchain/win/BUILD.gn b/chromium/build/toolchain/win/BUILD.gn
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+++ b/chromium/build/toolchain/win/BUILD.gn
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+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Should only be running on Windows.
+assert(is_win)
+
+# Setup the Visual Studio state.
+#
+# Its argument is the location to write the environment files.
+# It will write "environment.x86" and "environment.x64" to this directory,
+# and return a list to us.
+#
+# The list contains the include path as its only element. (I'm expecting to
+# add more so it's currently a list inside a list.)
+#exec_script("get_msvc_config.py",
+                     #     [relative_root_output_dir],
+                     #     "value")
+
+# This will save the environment block and and copy the gyp-win-tool to the
+# build directory. We pass in the source file of the win tool.
+gyp_win_tool_source =
+  rebase_path("//tools/gyp/pylib/gyp/win_tool.py", ".", root_build_dir)
+exec_script("setup_toolchain.py", [ gyp_win_tool_source ], "value")
+
+stamp_command = "$python_path gyp-win-tool stamp \$out"
+copy_command = "$python_path gyp-win-tool recursive-mirror \$in \$out"
+
+# 32-bit toolchain -------------------------------------------------------------
+
+toolchain("32") {
+  # Make these apply to all tools below.
+  lib_prefix = ""
+  lib_dir_prefix="/LIBPATH:"
+
+  cc_command = "ninja -t msvc -e environment.x86 -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out /Fd\$pdbname"
+  tool("cc") {
+    command = cc_command
+    description = "CC \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$defines \$includes \$cflags \$cflags_c"
+    deps = "msvc"
+  }
+  tool("cxx") {
+    command = cc_command  # Same as above
+    description = "CXX \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$defines \$includes \$cflags \$cflags_cc"
+    deps = "msvc"
+  }
+  tool("rc") {
+    command = "$python_path gyp-win-tool rc-wrapper environment.x86 rc.exe \$defines \$includes \$rcflags /fo\$out \$in"
+    description = "RC \$in"
+  }
+  tool("asm") {
+    command = "$python_path gyp-win-tool asm-wrapper environment.x86 ml.exe \$defines \$includes /c /Fo \$out \$in"
+    description = "ASM \$in"
+  }
+  tool("alink") {
+    command = "$python_path gyp-win-tool link-wrapper environment.x86 lib.exe /nologo /ignore:4221 /OUT:\$out @\$out.rsp"
+    description = "LIB \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$in_newline \$libflags"
+  }
+  tool("solink") {
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x86 link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper environment.x86 cmd /c if exist \$dll.manifest del \$dll.manifest && $python_path gyp-win-tool manifest-wrapper environment.x86 mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"
+    description = "LINK(DLL) \$dll"
+    restat = "1"
+    rspfile = "\$dll.rsp"
+    rspfile_content = "\$libs \$in_newline \$ldflags"
+  }
+  tool("link") {
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x86 link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper environment.x86 cmd /c if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool manifest-wrapper environment.x86 mt.exe -nologo -manifest \$manifests -out:\$out.manifest"
+    description = "LINK \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$in_newline \$libs \$ldflags"
+  }
+  tool("stamp") {
+    command = stamp_command
+    description = "STAMP \$out"
+  }
+  tool("copy") {
+    command = copy_command
+    description = "COPY \$in \$out"
+  }
+}
+
+# 64-bit toolchain -------------------------------------------------------------
+
+toolchain("64") {
+  # Make these apply to all tools below.
+  lib_prefix = ""
+  lib_dir_prefix="/LIBPATH:"
+
+  cc_command = "ninja -t msvc -e environment.x64 -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out /Fd\$pdbname"
+  tool("cc") {
+    command = cc_command
+    description = "CC \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$defines \$includes \$cflags \$cflags_c"
+    deps = "msvc"
+  }
+  tool("cxx") {
+    command = cc_command  # Same as above
+    description = "CXX \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$defines \$includes \$cflags \$cflags_cc"
+    deps = "msvc"
+  }
+  tool("rc") {
+    command = "$python_path gyp-win-tool rc-wrapper environment.x64 rc.exe \$defines \$includes \$rcflags /fo\$out \$in"
+    description = "RC \$in"
+  }
+  tool("asm") {
+    command = "$python_path gyp-win-tool asm-wrapper environment.x64 ml.exe \$defines \$includes /c /Fo \$out \$in"
+    description = "ASM \$in"
+  }
+  tool("alink") {
+    command = "$python_path gyp-win-tool link-wrapper environment.x64 lib.exe /nologo /ignore:4221 /OUT:\$out @\$out.rsp"
+    description = "LIB \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$in_newline \$libflags"
+  }
+  tool("solink") {
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x64 link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper environment.x64 cmd /c if exist \$dll.manifest del \$dll.manifest && $python_path gyp-win-tool manifest-wrapper environment.x64 mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"
+    description = "LINK(DLL) \$dll"
+    restat = "1"
+    rspfile = "\$dll.rsp"
+    rspfile_content = "\$libs \$in_newline \$ldflags"
+  }
+  tool("link") {
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x64 link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper environment.x64 cmd /c if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool manifest-wrapper environment.x64 mt.exe -nologo -manifest \$manifests -out:\$out.manifest"
+    description = "LINK \$out"
+    rspfile = "\$out.rsp"
+    rspfile_content = "\$in_newline \$libs \$ldflags"
+  }
+  tool("stamp") {
+    command = stamp_command
+    description = "STAMP \$out"
+  }
+  tool("copy") {
+    command = copy_command
+    description = "COPY \$in \$out"
+  }
+
+  # When invoking this toolchain not as the default one, these args will be
+  # passed to the build. They are ignored when this is the default toolchain.
+  toolchain_args() {
+    cpu_arch = "x64"
+    # Normally the build config resets the CPU architecture to 32-bits. Setting
+    # this flag overrides that behavior.
+    force_win64 = true
+  }
+}