CompositorFrame: Implement ParamTraits versus StructTraits deserialization test

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

 // Copyright 2016 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_SERIALIZATION_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_H_
 
 #include <string.h>
 
 #include "mojo/public/cpp/bindings/array_traits_carray.h"
@@ skipping 49 matching lines @@
 
   if (need_copy) {
     memcpy(&result.front(), result_buffer, size);
     free(result_buffer);
   }
 
   return result;
 }
 
 template <typename MojomType, typename DataArrayType, typename UserType>
-bool StructDeserializeImpl(DataArrayType input, UserType* output) {
+bool StructDeserializeImpl(const DataArrayType& input, UserType* output) {
   static_assert(BelongsTo<MojomType, MojomTypeCategory::STRUCT>::value,
                 "Unexpected type.");
   using DataType = typename MojomType::Struct::Data_;
 
   if (input.is_null())
     return false;
 
-  void* input_buffer = input.empty() ? nullptr : &input.front();
+  void* input_buffer =
+      input.empty()
+          ? nullptr
+          : const_cast<void*>(reinterpret_cast<const void*>(&input.front()));
 
   // Please see comments in StructSerializeImpl.
   bool need_copy = !IsAligned(input_buffer);
 
   if (need_copy) {
     input_buffer = malloc(input.size());
     DCHECK(IsAligned(input_buffer));
     memcpy(input_buffer, &input.front(), input.size());
   }
 
   ValidationContext validation_context(input_buffer, input.size(), 0);
   bool result = false;
   if (DataType::Validate(input_buffer, &validation_context)) {
     auto data = reinterpret_cast<DataType*>(input_buffer);
     SerializationContext context;
     result = Deserialize<MojomType>(data, output, &context);
   }
 
   if (need_copy)
     free(input_buffer);
 
   return result;
 }
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_SERIALIZATION_H_