libyuv: Switch bots over to GN by default.

scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_linux_gcc.json

Index: scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_linux_gcc.json
diff --git a/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_linux_gcc.json b/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_linux_gcc.json
index e0132a5d872d93739cf64726ee8b61c0b0bb9425..b82a885491ccab929ca7cc6f637c131ba8fbbbab 100644
--- a/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_linux_gcc.json
+++ b/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_linux_gcc.json
@@ -128,6 +128,7 @@
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "GYP_CHROMIUM_NO_ACTION": "1",
       "GYP_DEFINES": "clang=0 component=static_library gomadir='[CACHE]/cipd/goma' target_arch=x64 use_goma=1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ -137,6 +138,19 @@
     "cmd": [
       "python",
       "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gn.py",
+      "--root=[SLAVE_BUILD]/src",
+      "gen",
+      "//out/Release",
+      "--args=is_clang=false is_debug=false target_cpu=\"x64\" use_goma=true goma_dir=\"[CACHE]/cipd/goma\""
+    ],
+    "cwd": "[SLAVE_BUILD]/src",
+    "name": "gn"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py",
       "--show-path",
       "python",
@@ -167,8 +181,7 @@
       "/creds/service_accounts/service-account-goma-client.json",
       "--goma-dir",
       "[CACHE]/cipd/goma",
-      "--",
-      "All"
+      "--"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"