electron/patches/chromium/build_gn.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Ales Pergl <alpergl@microsoft.com>
Date: Thu, 20 Sep 2018 17:44:29 -0700
Subject: build_gn.patch

These are variables we add to the root BUILDCONFIG so that they're available
everywhere, without having to import("//electron/.../flags.gni").

Additionally, we add the `:mas_build` config to every compiled file so that
the `MAS_BUILD` #define is available everywhere. This produces fewer patch
conflicts when upgrading than it would if we added a specific config dependency
only to those targets which had MAS_BUILD-relevant content in them. The
tradeoff is that switching from MAS_BUILD to !MAS_BUILD or vice-versa will
rebuild the entire tree.

diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index a373e55a330f7c8f330be9f430c7e1f41ead42f7..e54d716ee7b046527c09727c0646d7235447cfd6 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -123,6 +123,9 @@ if (current_os == "") {
 #   even if the value is overridden, which is wasteful. See first bullet.
 
 declare_args() {
+  is_electron_build = false
+  is_mas_build = false
+
   # Set to enable the official build level of optimization. This has nothing
   # to do with branding, but enables an additional level of optimization above
   # release (!is_debug). This might be better expressed as a tri-state
@@ -352,6 +355,7 @@ default_compiler_configs = [
   "//build/config/compiler/pgo:default_pgo_flags",
   "//build/config/coverage:default_coverage",
   "//build/config/sanitizers:default_sanitizer_flags",
+  "//electron/build/config:mas_build",
 ]
 
 if (is_win) {