Mojo: Report bindings validation errors via MojoNotifyBadMessage

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

 // Copyright 2015 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_LIB_PIPE_CONTROL_MESSAGE_HANDLER_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_PIPE_CONTROL_MESSAGE_HANDLER_H_
 
+#include <string>
+
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/lib/interface_id.h"
 #include "mojo/public/cpp/bindings/lib/serialization_context.h"
 #include "mojo/public/cpp/bindings/message.h"
 
 namespace mojo {
 namespace internal {
 
 class PipeControlMessageHandlerDelegate;
 
 // Handler for messages defined in pipe_control_messages.mojom.
 class PipeControlMessageHandler : public MessageReceiver {
  public:
   explicit PipeControlMessageHandler(
       PipeControlMessageHandlerDelegate* delegate);
   ~PipeControlMessageHandler() override;
 
+  // Sets the interface name for this handler. Used only for debugging info.
+  void set_interface_name(const std::string& name) { interface_name_ = name; }
+
   // NOTE: |message| must have passed message header validation.
   static bool IsPipeControlMessage(const Message* message);
 
   // MessageReceiver implementation:
 
   // NOTE: |message| must:
   //   - 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;
+  Result Accept(Message* message) override;
 
  private:
   // |message| must have passed message header validation.
-  bool Validate(const Message* message);
+  Result Validate(Message* message);
   bool RunOrClosePipe(Message* message);
 
   PipeControlMessageHandlerDelegate* const delegate_;
   SerializationContext context_;
+  std::string interface_name_;
 
   DISALLOW_COPY_AND_ASSIGN(PipeControlMessageHandler);
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_PIPE_CONTROL_MESSAGE_HANDLER_H_