Mojo Example that demos the difference between providing and requesting an interface

examples/indirect_service/indirect_service_demo.mojom

Index: examples/indirect_service/indirect_service_demo.mojom
diff --git a/examples/echo/echo_service.mojom b/examples/indirect_service/indirect_service_demo.mojom
similarity index 54%
copy from examples/echo/echo_service.mojom
copy to examples/indirect_service/indirect_service_demo.mojom
index 561c25eb39d3cb6c58e2f4d9948f8278dfdf01fe..830fdbafa237511df2b4ef8aaeaa9541afff85cd 100644
--- a/examples/echo/echo_service.mojom
+++ b/examples/indirect_service/indirect_service_demo.mojom
@@ -4,6 +4,11 @@
 
 module mojo.examples;
 
-interface EchoService {
-  EchoString(string? value) => (string? value);
+interface IntegerService {
+  Increment() => (int32 value);
+};
+
+interface IndirectIntegerService {
+  Set(IntegerService? service);
+  Get(IntegerService&? service);
 };