Mojo C++ bindings: expose public <struct>DataView and StringDataView.

mojo/public/tools/bindings/generators/cpp_templates/struct_serialization_declaration.tmpl

 {%- import "struct_macros.tmpl" as struct_macros %}
 {%- set mojom_type = struct|get_qualified_name_for_kind %}
 {%- set data_type = struct|get_qualified_name_for_kind(internal=True) %}
 
 template <>
 struct StructTraits<{{mojom_type}}, {{mojom_type}}Ptr> {
   static bool IsNull(const {{mojom_type}}Ptr& input) { return !input; }
 
 {%- for field in struct.fields %}
 {%-   set return_ref = field.kind|is_object_kind or
@@ skipping 10 matching lines @@
     return input->{{field.name}};
   }
 {%-   else %}
   static decltype({{mojom_type}}::{{field.name}}) {{field.name}}(
       const {{mojom_type}}Ptr& input) {
     return input->{{field.name}};
   }
 {%-   endif %}
 {%- endfor %}
 
-  static bool ReadFromRawData({{data_type}}* input,
-                              {{mojom_type}}Ptr* output,
-                              internal::SerializationContext* context);
+  static bool ReadFromDataView({{mojom_type}}DataView input,
+                               {{mojom_type}}Ptr* output);
 };
 
 namespace internal {
 
 template <typename MaybeConstUserType>
 struct Serializer<{{mojom_type}}Ptr, MaybeConstUserType> {
   using UserType = typename std::remove_const<MaybeConstUserType>::type;
   using Traits = StructTraits<{{mojom_type}}, UserType>;
 
   static size_t PrepareToSerialize(MaybeConstUserType& input,
@@ skipping 15 matching lines @@
                                 "context", True)|indent(4)}}
       *output = result;
     } else {
       *output = nullptr;
     }
   }
 
   static bool Deserialize({{data_type}}* input,
                           UserType* output,
                           SerializationContext* context) {
-    return ReadCaller<Traits, HasReadFromRawDataMethod<Traits>::value>::Run(
+    return ReadCaller<Traits, HasReadFromDataViewMethod<Traits>::value>::Run(
         input, output, context);
   }
 
 
  public:
-  template <typename Traits, bool use_read_from_raw_data>
+  template <typename Traits, bool use_read_from_data_view>
   struct ReadCaller;
 
   template <typename Traits>
   struct ReadCaller<Traits, false> {
     static bool Run({{data_type}}* input,
                     UserType* output,
                     SerializationContext* context) {
       {{mojom_type}}_Reader reader(input, context);
       return Traits::Read(reader, output);
     }
   };
 
   template <typename Traits>
   struct ReadCaller<Traits, true> {
     static bool Run({{data_type}}* input,
                     UserType* output,
                     SerializationContext* context) {
-      return Traits::ReadFromRawData(input, output, context);
+      {{mojom_type}}DataView data_view(input, context);
+      return Traits::ReadFromDataView(data_view, output);
     }
   };
 };
 
 }  // namespace internal