[reclient] Add re client windows configs.

This should allow us to build chrome using reclient on windows.

Change-Id: Ie8f1f761ce227b16fbcd87cbb5a52b942dfe2b1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2732289
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Rubens Farias <rubensf@google.com>
Cr-Commit-Position: refs/heads/master@{#859553}

build/toolchain/win/BUILD.gn

@@ -8,6 +8,7 @@ import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/win/visual_studio_version.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/goma.gni")
+import("//build/toolchain/rbe.gni")
 import("//build/toolchain/toolchain.gni")
 
 # Should only be running on Windows.
@@ -22,7 +23,11 @@ assert(is_win)
 # This tool will is used as a wrapper for various commands below.
 tool_wrapper_path = rebase_path("tool_wrapper.py", root_build_dir)
 
-if (use_goma) {
+if (use_rbe) {
+  goma_prefix = ""
+  rbe_prefix = "${rbe_bin_dir}/rewrapper -cfg=${rbe_cc_cfg_file} -exec_root=${rbe_exec_root} "
+  clang_prefix = rbe_prefix
+} else if (use_goma) {
   if (host_os == "win") {
     goma_prefix = "$goma_dir/gomacc.exe "
   } else {

buildtools/reclient_cfgs/rewrapper_windows.cfg

@@ -0,0 +1,5 @@
+platform=container-image=docker://gcr.io/goma-rbe-images/chromium_win/remoteexec-platform@sha256:3b5893f5a59316c635b6077c94c5dc518dbe68f51a7e55fe4845809ab7440df3,OSFamily=Windows
+server_address=pipe://re-client.ipc
+labels=type=compile,compiler=clang-cl,lang=cpp
+exec_strategy=remote_local_fallback
+inputs=third_party\llvm-build\Release+Asserts