1 files changed, 10 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/build/scripts/templates/macros.tmpl b/chromium/third_party/blink/renderer/build/scripts/templates/macros.tmpl
index dcdbb02a56c..d446c30767b 100644
--- a/chromium/third_party/blink/renderer/build/scripts/templates/macros.tmpl
+++ b/chromium/third_party/blink/renderer/build/scripts/templates/macros.tmpl
@@ -76,3 +76,13 @@ case {{ length }}:
 {% macro print_if(predicate, str) -%}
 {% if predicate %}{{str}}{% endif %}
 {%- endmacro %}
+
+
+{# See //docs/lacros.md for details on these Chrome OS defines. #}
+{%- macro platform_define(platform) -%}
+{%- if platform|lower == 'chromeos' -%}
+(BUILDFLAG(IS_CHROMEOS_ASH) || BUILDFLAG(IS_CHROMEOS_LACROS))
+{%- else -%}
+defined(OS_{{platform | upper}})
+{%- endif -%}
+{%- endmacro -%}