Mojo bindings: merge the control messages of sending disconnect reason and notifying endpoint close…

mojo/public/cpp/bindings/pipe_control_message_handler_delegate.h

Index: mojo/public/cpp/bindings/pipe_control_message_handler_delegate.h
diff --git a/mojo/public/cpp/bindings/pipe_control_message_handler_delegate.h b/mojo/public/cpp/bindings/pipe_control_message_handler_delegate.h
index 06f0695700599d27d717da837405572925802715..4b252c3eed2d2842ab02a8864f5f5bc7125d1ebf 100644
--- a/mojo/public/cpp/bindings/pipe_control_message_handler_delegate.h
+++ b/mojo/public/cpp/bindings/pipe_control_message_handler_delegate.h
@@ -5,6 +5,8 @@
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_PIPE_CONTROL_MESSAGE_HANDLER_DELEGATE_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_PIPE_CONTROL_MESSAGE_HANDLER_DELEGATE_H_
 
+#include "base/optional.h"
+#include "mojo/public/cpp/bindings/disconnect_reason.h"
 #include "mojo/public/cpp/bindings/interface_id.h"
 
 namespace mojo {
@@ -14,7 +16,9 @@ class PipeControlMessageHandlerDelegate {
   // The implementation of the following methods should return false if the
   // notification is unexpected. In that case, the user of this delegate is
   // expected to close the message pipe.
-  virtual bool OnPeerAssociatedEndpointClosed(InterfaceId id) = 0;
+  virtual bool OnPeerAssociatedEndpointClosed(
+      InterfaceId id,
+      const base::Optional<DisconnectReason>& reason) = 0;
   virtual bool OnAssociatedEndpointClosedBeforeSent(InterfaceId id) = 0;
 
  protected: