mac-arm64: Package universalizer and tools to ship to designated bot

This includes universalizer.py and the Widevine signing scripts.

Depends on:

https://chromium-review.googlesource.com/c/2515521
and
https://chrome-internal-review.googlesource.com/c/3383223
https://chrome-internal-review.googlesource.com/c/3380436 (DEPS)
https://chromium-review.googlesource.com/c/2520327 (DEPS)

Code-Word: calamity
Bug: 1142017
Change-Id: I83bc47a2edbd031f4d7f291a6b4922d3c862f1eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518800
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824392}

chrome/installer/mac/BUILD.gn

@@ -9,6 +9,10 @@ import("//build/util/version.gni")
 import("//chrome/process_version_rc_template.gni")
 import("mac_signing_sources.gni")
 
+if (is_chrome_branded) {
+  import("//third_party/widevine/scripts/widevine_signing_sources.gni")
+}
+
 group("mac") {
   public_deps = [ ":copies" ]
 }
@@ -54,6 +58,18 @@ copy("copy_signing") {
   outputs = [ "$_packaging_dir/signing/{{source_file_part}}" ]
 }
 
+if (is_chrome_branded) {
+  copy("copy_widevine_signing") {
+    visibility = [ ":copies" ]
+
+    sources = rebase_path(widevine_signing_sources,
+                          "",
+                          "//third_party/widevine/scripts")
+
+    outputs = [ "$_packaging_dir/widevine/{{source_file_part}}" ]
+  }
+}
+
 copy("copies") {
   visibility = [ ":mac" ]
 
@@ -84,13 +100,11 @@ copy("copies") {
     "pkg-dmg",
     "pkg_postinstall.in",
     "sign_chrome.py",
+    "universalizer.py",
   ]
 
   if (is_chrome_branded) {
-    sources += [ "keystone_install.sh" ]
-  }
-
-  if (is_chrome_branded) {
+    deps += [ ":copy_widevine_signing" ]
     sources += [
       "//chrome/app/theme/google_chrome/mac/app_beta.icns",
       "//chrome/app/theme/google_chrome/mac/app_canary.icns",
@@ -111,6 +125,7 @@ copy("copies") {
       "internal/chrome_dmg_background.png",
       "internal/chrome_dmg_dsstore",
       "internal/chrome_dmg_icon.icns",
+      "keystone_install.sh",
     ]
   }