Mojo C++ bindings: better log message for serialization warnings.

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

Index: mojo/public/cpp/bindings/lib/validation_errors.h
diff --git a/mojo/public/cpp/bindings/lib/validation_errors.h b/mojo/public/cpp/bindings/lib/validation_errors.h
index 3de04e32c09c75d007dc7003049fcb5c148b8473..d9d8ff8d445b4fc4f1782846e8f1f453a59ec904 100644
--- a/mojo/public/cpp/bindings/lib/validation_errors.h
+++ b/mojo/public/cpp/bindings/lib/validation_errors.h
@@ -106,9 +106,10 @@ bool IsNonNullableValidationEnabled();
 // of the serialzation result.
 //
 // In non-debug build, does nothing (not even compiling |condition|).
-#define MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(condition, error) \
+#define MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(condition, error, cause) \
     MOJO_DLOG_IF(FATAL, (condition) && !ReportSerializationWarning(error)) \
         << "The outgoing message will trigger " \
-        << ValidationErrorToString(error) << " at the receiving side.";
+        << ValidationErrorToString(error) << " at the receiving side. (" \

[hansmuller, 2014/08/21 00:26:40]

I'm sure this is fine as is, but maybe you should move the period to after the
parenthesized expression.

[yzshen1, 2014/08/21 05:57:49]

Done.

+        << cause << ")";
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_VALIDATION_ERRORS_H_