Stub in more IPC attachment brokering functionality.

ipc/ipc_message.cc

Index: ipc/ipc_message.cc
diff --git a/ipc/ipc_message.cc b/ipc/ipc_message.cc
index 7aa268e6dfba9143a8c9e4d9f7987bd60ffa7628..acdb8607e3a8fe9e00464e05cba31ca7ed3c7bbc 100644
--- a/ipc/ipc_message.cc
+++ b/ipc/ipc_message.cc
@@ -160,4 +160,9 @@ bool Message::HasMojoHandles() const {
   return attachment_set_.get() && 0 < attachment_set_->num_mojo_handles();
 }
 
+bool Message::HasBrokerableAttachments() const {
+  return attachment_set_.get() &&
+         0 < attachment_set_->num_brokerable_attachments();

[Tom Sepez, 2015/06/19 18:04:11]

nit: prefer blah > 0 to 0 < blah despite what the mojo folks did above.  Let's
fix both.

[erikchen, 2015/06/23 22:37:00]

Done.

+}
+
 }  // namespace IPC