chore: add GN linting (#14678)

* chore: add GN linter

* chore: fix GN lint errors

* try some crazy bash to get a gn exe

* base64 on linux is different

* cloning build_tools doesn't download GN

* download_from_google_storage needs depot_tools in the path

* fixup! chore: add GN linter

build/config/BUILD.gn

@@ -17,6 +17,7 @@ config("build_time_executable") {
     }
   }
 }
+
 # For MAS build, we force defining "MAS_BUILD".
 config("mas_build") {
   if (is_mas_build) {

build/npm.gni

@@ -1,16 +1,22 @@
 template("npm_action") {
   assert(defined(invoker.script),
          "Need script name to run (must be defined in package.json)")
-  assert(defined(invoker.args),
-         "Need script argumets")
+  assert(defined(invoker.args), "Need script argumets")
 
   action(target_name) {
-    forward_variables_from(invoker, ["deps", "public_deps", "sources", "inputs", "outputs"])
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "public_deps",
+                             "sources",
+                             "inputs",
+                             "outputs",
+                           ])
     script = "//electron/build/npm-run.py"
     args = [
-      "--silent",
-      invoker.script,
-      "--"
-    ] + invoker.args
+             "--silent",
+             invoker.script,
+             "--",
+           ] + invoker.args
   }
 }