NOT TO COMMITTED: Update mojo sdk to rev 0018e6a91b75bcb941c867f8a7aa1753c3b53a13

third_party/mojo/src/mojo/public/cpp/bindings/lib/validation_errors.h

Index: third_party/mojo/src/mojo/public/cpp/bindings/lib/validation_errors.h
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/lib/validation_errors.h b/third_party/mojo/src/mojo/public/cpp/bindings/lib/validation_errors.h
index d09f63b81f5f6b60aa5fdc64173d3cbcf0ab6cbd..1d15bc9acf8565ac5bdaec42057e2d82fd049e57 100644
--- a/third_party/mojo/src/mojo/public/cpp/bindings/lib/validation_errors.h
+++ b/third_party/mojo/src/mojo/public/cpp/bindings/lib/validation_errors.h
@@ -39,11 +39,17 @@ enum ValidationError {
   VALIDATION_ERROR_ILLEGAL_POINTER,
   // A non-nullable pointer field is set to null.
   VALIDATION_ERROR_UNEXPECTED_NULL_POINTER,
-  // |flags| in the message header is an invalid flag combination.
-  VALIDATION_ERROR_MESSAGE_HEADER_INVALID_FLAG_COMBINATION,
+  // |flags| in the message header is invalid. The flags are either
+  // inconsistent with one another, inconsistent with other parts of the
+  // message, or unexpected for the message receiver.  For example the
+  // receiver is expecting a request message but the flags indicate that
+  // the message is a response message.
+  VALIDATION_ERROR_MESSAGE_HEADER_INVALID_FLAGS,
   // |flags| in the message header indicates that a request ID is required but
   // there isn't one.
   VALIDATION_ERROR_MESSAGE_HEADER_MISSING_REQUEST_ID,
+  // The |name| field in a message header contains an unexpected value.
+  VALIDATION_ERROR_MESSAGE_HEADER_UNKNOWN_METHOD,
   // Two parallel arrays which are supposed to represent a map have different
   // lengths.
   VALIDATION_ERROR_DIFFERENT_SIZED_ARRAYS_IN_MAP,