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..f9cc1e3599efa037f6eb9c1ac1d8523ab780a187 100644
--- a/mojo/public/cpp/bindings/lib/pipe_control_message_handler.h
+++ b/mojo/public/cpp/bindings/lib/pipe_control_message_handler.h
@@ -5,6 +5,8 @@
 #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"
@@ -22,6 +24,9 @@ class PipeControlMessageHandler : public MessageReceiver {
       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);
 
@@ -31,15 +36,16 @@ 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;
+  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);
 };