Mojo: Support enums as map keys in WTF

mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl

Index: mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
index 9306d2f816d01b260f5203732f517b3d5b06f799..acdad5eeb254869d7a846b54c012d6f22ceff7c4 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
@@ -86,6 +86,16 @@ namespace {{variant}} {
 #include "{{export_header}}"
 {%- endif %}
 
+{#--- WTF enum hashing #}
+{%- from "enum_macros.tmpl" import enum_hash_blink%}
+{%- if for_blink %}
+{%-   for enum in all_enums %}
+{%-     if not enum|is_native_only_kind %}
+{{enum_hash_blink(enum)}}
+{%-     endif %}
+{%-   endfor %}
+{%- endif %}
+
 {{namespace_begin()}}
 
 {#--- Enums #}