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

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

 // Copyright 2013 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_ARRAY_INTERNAL_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_INTERNAL_H_
 
 #include <new>
 #include <vector>
 
 #include "mojo/public/c/system/macros.h"
 #include "mojo/public/cpp/bindings/lib/bindings_internal.h"
 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
 #include "mojo/public/cpp/bindings/lib/bounds_checker.h"
 #include "mojo/public/cpp/bindings/lib/buffer.h"
 #include "mojo/public/cpp/bindings/lib/template_util.h"
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 #include "mojo/public/cpp/environment/logging.h"
 
 namespace mojo {
 template <typename T> class Array;
 class String;
 
 namespace internal {
 
 // std::numeric_limits<uint32_t>::max() is not a compile-time constant (until
 // C++11).
 const uint32_t kMaxUint32 = 0xFFFFFFFF;
 
+std::string MakeMessageWithArrayIndex(const char* message,
+                                      size_t size,
+                                      size_t index);
+
+std::string MakeMessageWithExpectedArraySize(const char* message,
+                                             size_t size,
+                                             size_t expected_size);
+
 template <typename T>
 struct ArrayDataTraits {
   typedef T StorageType;
   typedef T& Ref;
   typedef T const& ConstRef;
 
   static const uint32_t kMaxNumElements =
       (kMaxUint32 - sizeof(ArrayHeader)) / sizeof(StorageType);
 
   static uint32_t GetStorageSize(uint32_t num_elements) {
@@ skipping 442 matching lines @@
 };
 
 template <> struct WrapperTraits<String, false> {
   typedef String_Data* DataType;
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_INTERNAL_H_