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diff --git a/mojo/public/cpp/bindings/interface_endpoint_controller.h b/mojo/public/cpp/bindings/interface_endpoint_controller.h
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_ENDPOINT_CONTROLLER_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_ENDPOINT_CONTROLLER_H_
+
+namespace mojo {
+
+class Message;
+
+// A control interface exposed by AssociatedGroupController for interface
+// endpoints.
+class InterfaceEndpointController {
+ public:
+  virtual ~InterfaceEndpointController() {}
+
+  virtual bool SendMessage(Message* message) = 0;
+
+  // Allows the interface endpoint to watch for incoming sync messages while
+  // others perform sync handle watching on the same thread. Please see comments
+  // of SyncHandleWatcher::AllowWokenUpBySyncWatchOnSameThread().
+  virtual void AllowWokenUpBySyncWatchOnSameThread() = 0;
+
+  // Watches the interface endpoint for incoming sync messages. (It also watches
+  // other other handles registered to be watched together.)
+  // This method:
+  //   - returns true when |should_stop| is set to true;
+  //   - return false otherwise, including
+  //     MultiplexRouter::DetachEndpointClient() being called for the same
+  //     interface endpoint.
+  virtual bool SyncWatch(const bool* should_stop) = 0;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_ENDPOINT_CONTROLLER_H_