Mojo C++ Bindings: Make hashing of typemapped enums optional

mojo/public/tools/bindings/generators/mojom_cpp_generator.py

Index: mojo/public/tools/bindings/generators/mojom_cpp_generator.py
diff --git a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
index 07eb45bfc3ec2681a844efcd9b5295fe3abc7456..2cf791fab0fe79d4181d5289c185f53ed31f3c6a 100644
--- a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
@@ -196,6 +196,11 @@ def IsHashableKind(kind):
           not _current_typemap[GetFullMojomNameForKind(kind)]["hashable"]):
         return False
       return all(Check(field.kind) for field in kind.fields)
+    elif mojom.IsEnumKind(kind):
+      if (IsTypemappedKind(kind) and
+          not _current_typemap[GetFullMojomNameForKind(kind)]["hashable"]):
+        return False
+      return True
     elif mojom.IsUnionKind(kind):
       return all(Check(field.kind) for field in kind.fields)
     elif mojom.IsAnyHandleKind(kind):