recipes: Add a GN flavor.

infra/bots/recipe_modules/skia/api.py

Index: infra/bots/recipe_modules/skia/api.py
diff --git a/infra/bots/recipe_modules/skia/api.py b/infra/bots/recipe_modules/skia/api.py
index d6c73270dbe1c9f22960efac81f636ff1ca1517e..2991098c0003a0132034c775777a582795c10616 100644
--- a/infra/bots/recipe_modules/skia/api.py
+++ b/infra/bots/recipe_modules/skia/api.py
@@ -19,6 +19,7 @@ from . import cmake_flavor
 from . import coverage_flavor
 from . import default_flavor
 from . import fake_specs
+from . import gn_flavor
 from . import ios_flavor
 from . import pdfium_flavor
 from . import valgrind_flavor
@@ -65,6 +66,10 @@ def is_cmake(builder_cfg):
   return 'CMake' in builder_cfg.get('extra_config', '')
 
 
+def is_gn(builder_cfg):
+  return 'GN' in builder_cfg.get('extra_config', '')
+
+
 def is_ios(builder_cfg):
   return ('iOS' in builder_cfg.get('extra_config', '') or
           builder_cfg.get('os') == 'iOS')
@@ -92,6 +97,8 @@ class SkiaApi(recipe_api.RecipeApi):
       return android_flavor.AndroidFlavorUtils(self)
     elif is_cmake(builder_cfg):
       return cmake_flavor.CMakeFlavorUtils(self)
+    elif is_gn(builder_cfg):
+      return gn_flavor.GNFlavorUtils(self)
     elif is_ios(builder_cfg):
       return ios_flavor.iOSFlavorUtils(self)
     elif is_pdfium(builder_cfg):