Move generated Mojo C++ error reporting code out of line

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

 // Copyright 2014 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_VALIDATION_ERRORS_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_VALIDATION_ERRORS_H_
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/lib/validation_context.h"
 
 namespace mojo {
+
+class Message;
+
 namespace internal {
 
 enum ValidationError {
   // There is no validation error.
   VALIDATION_ERROR_NONE,
   // An object (struct or array) is not 8-byte aligned.
   VALIDATION_ERROR_MISALIGNED_OBJECT,
   // An object is not contained inside the message data, or it overlaps other
   // objects.
   VALIDATION_ERROR_ILLEGAL_MEMORY_RANGE,
@@ skipping 44 matching lines @@
   // validation logic.
   VALIDATION_ERROR_DESERIALIZATION_FAILED,
 };
 
 const char* ValidationErrorToString(ValidationError error);
 
 void ReportValidationError(ValidationContext* context,
                            ValidationError error,
                            const char* description = nullptr);
 
+void ReportValidationErrorForMessage(
+    mojo::Message* message,
+    ValidationError error,
+    const base::StringPiece& description = "");

[yzshen1, 2016/07/31 07:16:32]

nit: does it make sense to use the same type for |description| as
ReportValidationError()?

[tibell, 2016/07/31 23:50:29]

Done.

+
 // Only used by validation tests and when there is only one thread doing message
 // validation.
 class ValidationErrorObserverForTesting {
  public:
   explicit ValidationErrorObserverForTesting(const base::Closure& callback);
   ~ValidationErrorObserverForTesting();
 
   ValidationError last_error() const { return last_error_; }
   void set_last_error(ValidationError error) {
     last_error_ = error;
@@ skipping 42 matching lines @@
 //
 // In non-debug build, does nothing (not even compiling |condition|).
 #define MOJO_INTERNAL_DLOG_SERIALIZATION_WARNING(condition, error,    \
                                                  description)         \
   DLOG_IF(FATAL, (condition) && !ReportSerializationWarning(error))   \
       << "The outgoing message will trigger "                         \
       << ValidationErrorToString(error) << " at the receiving side (" \
       << description << ").";
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_VALIDATION_ERRORS_H_