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diff --git a/taskcluster/scripts/misc/build-custom-car-win64.sh b/taskcluster/scripts/misc/build-custom-car-win64.sh
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+#!/bin/bash
+set -x -e -v
+
+# This script is for building a custom version of chromium-as-release on Windows
+
+# First argument must be the artifact name
+ARTIFACT_NAME=$(basename $TOOLCHAIN_ARTIFACT)
+shift
+
+# Use the rest of the arguments as the build config
+CONFIG=$(echo $* | tr -d "'")
+
+mkdir custom_car
+cd custom_car
+CUSTOM_CAR_DIR=$PWD
+
+# setup VS 2022
+. $GECKO_PATH/taskcluster/scripts/misc/vs-setup.sh
+
+# setup depot_tools
+git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+export PATH="$(cd ./depot_tools && pwd):$PATH"
+
+# setup some environment variables for chromium build scripts
+export DEPOT_TOOLS_WIN_TOOLCHAIN=0
+export GYP_MSVS_OVERRIDE_PATH="$MOZ_FETCHES_DIR/VS"
+export GYP_MSVS_VERSION=2022
+export vs2022_install="$MOZ_FETCHES_DIR/VS"
+export WINDOWSSDKDIR="$MOZ_FETCHES_DIR/VS/Windows Kits/10"
+export DEPOT_TOOLS_UPDATE=1
+export GCLIENT_PY3=1
+# Fool GYP
+touch "$MOZ_FETCHES_DIR/VS/VC/vcvarsall.bat"
+
+
+# construct some of our own dirs and move VS dlls + other files
+# to a path that chromium build files are expecting
+mkdir chrome_dll
+cd chrome_dll
+mkdir system32
+cd ../
+pushd "$WINDOWSSDKDIR"
+mkdir -p Debuggers/x64/
+popd
+mv $MOZ_FETCHES_DIR/VS/VC/Redist/MSVC/14.34.31931/x64/Microsoft.VC143.CRT/* chrome_dll/system32/
+mv "$WINDOWSSDKDIR/App Certification Kit/"* "$WINDOWSSDKDIR"/Debuggers/x64/
+export WINDIR="$PWD/chrome_dll"
+
+# run glcient once first to get some windows deps
+gclient
+
+# fetch chromium src code
+mkdir chromium
+cd chromium
+fetch --no-history --nohooks chromium
+
+# setup the .gclient file to ensure pgo profiles are downloaded 
+# for some reason we need to set --name flag even though it already exists.
+# currently the gclient.py file does NOT recognize --custom-var as it's own argument
+gclient config --name src https://chromium.googlesource.com/chromium/src.git --custom-var=checkout_pgo_profiles=True --unmanaged
+
+cd src
+
+# For fast fetches it seems we will be missing some dummy files in windows.
+# We can create a dummy this way to satisfy the rest of the build sequence
+# this is ok because we are not doing any development here and don't need 
+# history.
+python3 build/util/lastchange.py -o build/util/LASTCHANGE
+
+# now we can run hooks and fetch PGO + everything else
+gclient runhooks
+
+# PGO data should be in src/chrome/build/pgo_profiles/ 
+# with a name like "chrome-{OS}-<some unique identifier>"
+export PGO_DATA_DIR="$CUSTOM_CAR_DIR/chromium/src/chrome/build/pgo_profiles"
+for entry in "$PGO_DATA_DIR"/*
+do
+  if [ -f "$entry" ];then
+    export PGO_DATA_PATH="$entry"
+  fi
+done
+# compute a relative path that the build scripts looks for.
+# this odd pathing seems to only happen on windows
+PGO_FILE=${PGO_DATA_PATH#*/*/*/*/*/*/*/*/*/}
+mv $PGO_DATA_PATH build/config/compiler/pgo/
+CONFIG=$(echo $CONFIG pgo_data_path='"'$PGO_FILE'"')
+
+# set up then build chrome
+gn gen out/Default --args="$CONFIG"
+autoninja -C out/Default chrome # skips test binaries
+
+# Gather binary and related files into a zip, and upload it
+cd ..
+mkdir chromium
+
+mv src/out/Default chromium
+chmod -R +x chromium
+
+tar caf $ARTIFACT_NAME chromium
+
+mkdir -p $UPLOAD_DIR
+mv $ARTIFACT_NAME $UPLOAD_DIR