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

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

 // 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.
 
 #include "mojo/public/cpp/bindings/lib/array_internal.h"
 
+#include <sstream>
+
 namespace mojo {
 namespace internal {
 
+std::string MakeMessageWithArrayIndex(const char* message,
+                                      size_t size,
+                                      size_t index) {
+  std::ostringstream stream;
+  stream << message << ": array size - " << size << "; index - " << index;
+  return stream.str();
+}
+
+std::string MakeMessageWithExpectedArraySize(const char* message,
+                                             size_t size,
+                                             size_t expected_size) {
+  std::ostringstream stream;
+  stream << message << ": array size - " << size << "; expected size - "
+         << expected_size;
+  return stream.str();
+}
+
 ArrayDataTraits<bool>::BitRef::~BitRef() {
 }
 
 ArrayDataTraits<bool>::BitRef::BitRef(uint8_t* storage, uint8_t mask)
     : storage_(storage),
       mask_(mask) {
 }
 
 ArrayDataTraits<bool>::BitRef&
 ArrayDataTraits<bool>::BitRef::operator=(bool value) {
@@ skipping 27 matching lines @@
 void ArraySerializationHelper<Handle, true>::DecodePointersAndHandles(
     const ArrayHeader* header,
     ElementType* elements,
     std::vector<Handle>* handles) {
   for (uint32_t i = 0; i < header->num_elements; ++i)
     DecodeHandle(&elements[i], handles);
 }
 
 }  // namespace internal
 }  // namespace mojo