Mojo C++ bindings: introduce public associated-interface-related types.

mojo/public/cpp/bindings/lib/multiplex_router.cc

Index: mojo/public/cpp/bindings/lib/multiplex_router.cc
diff --git a/mojo/public/cpp/bindings/lib/multiplex_router.cc b/mojo/public/cpp/bindings/lib/multiplex_router.cc
index a2b057be9fbd7d3389254dca2cb25f3924d57156..c09fc17ff4b2ad9deee6d513589f6b5bd1a8f524 100644
--- a/mojo/public/cpp/bindings/lib/multiplex_router.cc
+++ b/mojo/public/cpp/bindings/lib/multiplex_router.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/stl_util.h"
+#include "mojo/public/cpp/bindings/associated_group.h"
 #include "mojo/public/cpp/bindings/lib/interface_endpoint_client.h"
 
 namespace mojo {
@@ -284,6 +285,17 @@ void MultiplexRouter::RaiseError() {
   }
 }
 
+scoped_ptr<AssociatedGroup> MultiplexRouter::CreateAssociatedGroup() {
+  scoped_ptr<AssociatedGroup> group(new AssociatedGroup);
+  group->router_ = this;
+  return group.Pass();
+}
+
+// static
+MultiplexRouter* MultiplexRouter::GetRouter(AssociatedGroup* associated_group) {
+  return associated_group->router_.get();
+}
+
 ScopedMessagePipeHandle MultiplexRouter::PassMessagePipe() {
   DCHECK(thread_checker_.CalledOnValidThread());
   {