Mojo: Report bindings validation errors via MojoNotifyBadMessage

mojo/public/cpp/bindings/lib/pipe_control_message_handler.h

Index: mojo/public/cpp/bindings/lib/pipe_control_message_handler.h
diff --git a/mojo/public/cpp/bindings/lib/pipe_control_message_handler.h b/mojo/public/cpp/bindings/lib/pipe_control_message_handler.h
index c42d0bae3d1e7ccd67062d858f1e321f56275087..8f56fd8ca2fa0c31ced687d2541584622a23199c 100644
--- a/mojo/public/cpp/bindings/lib/pipe_control_message_handler.h
+++ b/mojo/public/cpp/bindings/lib/pipe_control_message_handler.h
@@ -31,11 +31,11 @@ class PipeControlMessageHandler : public MessageReceiver {
   //   - have passed message header validation; and
   //   - be a pipe control message (i.e., IsPipeControlMessage() returns true).
   // If the method returns false, the message pipe should be closed.
-  bool Accept(Message* message) override;
+  bool Accept(Message* message, Error* error) override;
 
  private:
   // |message| must have passed message header validation.
-  bool Validate(const Message* message);
+  bool Validate(Message* message, Error* error);
   bool RunOrClosePipe(Message* message);
 
   PipeControlMessageHandlerDelegate* const delegate_;