Interfaces declared first in header file.

mojo/public/interfaces/bindings/tests/test_structs.mojom

Index: mojo/public/interfaces/bindings/tests/test_structs.mojom
diff --git a/mojo/public/interfaces/bindings/tests/test_structs.mojom b/mojo/public/interfaces/bindings/tests/test_structs.mojom
index 7c492553700ad8e202b738ea887593d69183084f..adebff8d3f1f0e96d90bfb72022a1b8d93cfeb7d 100644
--- a/mojo/public/interfaces/bindings/tests/test_structs.mojom
+++ b/mojo/public/interfaces/bindings/tests/test_structs.mojom
@@ -352,3 +352,14 @@ struct MultiVersionStructV7 {
   [MinVersion=7]
   bool f_bool;
 };
+
+// Used to verify that interfaces that are struct members can be defined in the
+// same file.
+
+interface SomeInterface {
+  SomeMethod(RectPair pair) => (RectPair other_pair);
+};
+
+struct ContainsInterface {
+  SomeInterface some_interface;
+};