Make sure channel-associated interface pointers are always safe to call.

mojo/public/cpp/bindings/associated_interface_ptr.h

Index: mojo/public/cpp/bindings/associated_interface_ptr.h
diff --git a/mojo/public/cpp/bindings/associated_interface_ptr.h b/mojo/public/cpp/bindings/associated_interface_ptr.h
index 1d2ec0c1537a70eed7b6a60b47c05fda348cee64..8806a3e0901d23782c34435f483994c4dcfc2024 100644
--- a/mojo/public/cpp/bindings/associated_interface_ptr.h
+++ b/mojo/public/cpp/bindings/associated_interface_ptr.h
@@ -18,6 +18,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "mojo/public/cpp/bindings/associated_interface_ptr_info.h"
 #include "mojo/public/cpp/bindings/associated_interface_request.h"
+#include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/bindings/connection_error_callback.h"
 #include "mojo/public/cpp/bindings/lib/associated_interface_ptr_state.h"
 #include "mojo/public/cpp/bindings/lib/multiplex_router.h"
@@ -270,6 +271,13 @@ AssociatedInterfaceRequest<Interface> MakeIsolatedRequest(
   return request;
 }
 
+// |handle| is supposed to be the request of an associated interface. This
+// method associates the interface with a dedicated, disconnected message pipe.
+// That way, the corresponding associated interface pointer of |handle| can
+// safely make calls (although those calls are silently dropped).
+MOJO_CPP_BINDINGS_EXPORT void GetIsolatedInterface(
+    ScopedInterfaceEndpointHandle handle);
+
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_PTR_H_