7ab0daeedf
EventStreamSubscription.listen does a cast which is only working in DDC because we're ignoring the failure. This wraps the listener to check the argument rather than casting the function. Also picks up a few misc changes to the main SDK that hadn't been merged into DDC. BUG= R=jacobr@google.com Review-Url: https://codereview.chromium.org/2609633002 .