WIP bindings: Add support for the record<K,V> WebIDL type.

third_party/WebKit/Source/bindings/templates/union_container.cpp.tmpl

 {% from 'utilities.cpp.tmpl' import declare_enum_validation_variable %}
 {% from 'utilities.cpp.tmpl' import v8_value_to_local_cpp_value %}
 {#############################################################################}
 {% macro assign_and_return_if_hasinstance(member) %}
 {% if member.is_array_buffer_or_view_type %}
 if (v8Value->Is{{member.type_name}}()) {
 {% else %}
 if (V8{{member.type_name}}::hasInstance(v8Value, isolate)) {
 {% endif %}
   {{member.cpp_local_type}} cppValue = V8{{member.type_name}}::toImpl(v8::Local<v8::Object>::Cast(v8Value));
@@ skipping 80 matching lines @@
   {{assign_and_return_if_hasinstance(array_buffer_type) | indent(2)}}
 
   {% endif %}
   {# 9., 10. ArrayBufferView #}
   {# FIXME: Individual typed arrays (e.g. Uint8Array) aren\'t supported yet. #}
   {% if array_buffer_view_type %}
   {{assign_and_return_if_hasinstance(array_buffer_view_type) | indent(2)}}
 
   {% endif %}
   {% if array_or_sequence_type %}
-  {# 12.1, 12.2. Arrays and Sequences #}
+  {# 11.1, 11.2. Arrays and Sequences #}
   {# FIXME: This should also check "object but not RegExp". Add checks
      when we implement conversions for Date and RegExp. #}
   {# TODO(bashi): Should check @@iterator symbol instead. #}
   if (v8Value->IsArray()) {
     {{v8_value_to_local_cpp_value(array_or_sequence_type) | indent}}
     impl.set{{array_or_sequence_type.type_name}}(cppValue);
     return;
   }
 
   {% endif %}
   {% if dictionary_type %}
-  {# 12.3. Dictionaries #}
+  {# 11.3. Dictionaries #}
   if (v8Value->IsObject()) {
     {{v8_value_to_local_cpp_value(dictionary_type) | indent}}
     impl.set{{dictionary_type.type_name}}(cppValue);
     return;
   }
 
   {% endif %}
-  {# TODO(bashi): Support 12.4 Callback interface when we need it #}
-  {# 12.5. Objects #}
+  {# 11.4. Records #}
+  {% if record_type %}
+  if (v8Value->IsObject()) {
+    {{v8_value_to_local_cpp_value(record_type) | indent}}
+    impl.set{{record_type.type_name}}(cppValue);
+    return;
+  }
+
+  {% endif %}
+  {# TODO(bashi): Support 11.5 Callback interface when we need it #}
+  {# 11.6. Objects #}
   {% if object_type %}
   if (isUndefinedOrNull(v8Value) || v8Value->IsObject()) {
     {{v8_value_to_local_cpp_value(object_type) | indent}}
     impl.set{{object_type.type_name}}(cppValue);
     return;
   }
 
   {% endif %}
   {# FIXME: In some cases, we can omit boolean and numeric type checks because
      we have fallback conversions. (step 16 and 17) #}
   {% if boolean_type %}
-  {# 13. Boolean #}
+  {# 12. Boolean #}
   if (v8Value->IsBoolean()) {
     impl.setBoolean(v8Value.As<v8::Boolean>()->Value());
     return;
   }
 
   {% endif %}
   {% if numeric_type %}
-  {# 14. Number #}
+  {# 13. Number #}
   if (v8Value->IsNumber()) {
     {{v8_value_to_local_cpp_value(numeric_type) | indent}}
     impl.set{{numeric_type.type_name}}(cppValue);
     return;
   }
 
   {% endif %}
   {% if string_type %}
-  {# 15. String #}
+  {# 14. String #}
   {
     {{v8_value_to_local_cpp_value(string_type) | indent}}
     {% if string_type.enum_values %}
     {{declare_enum_validation_variable(string_type.enum_values) | indent}}
     if (!isValidEnum(cppValue, validValues, WTF_ARRAY_LENGTH(validValues), "{{string_type.type_name}}", exceptionState))
       return;
     {% endif %}
     impl.set{{string_type.type_name}}(cppValue);
     return;
   }
 
-  {# 16. Number (fallback) #}
+  {# 15. Number (fallback) #}
   {% elif numeric_type %}
   {
     {{v8_value_to_local_cpp_value(numeric_type) | indent}}
     impl.set{{numeric_type.type_name}}(cppValue);
     return;
   }
 
-  {# 17. Boolean (fallback) #}
+  {# 16. Boolean (fallback) #}
   {% elif boolean_type %}
   {
     impl.setBoolean(v8Value->BooleanValue());
     return;
   }
 
   {% else %}
-  {# 18. TypeError #}
+  {# 17. TypeError #}
   exceptionState.throwTypeError("The provided value is not of type '{{type_string}}'");
   {% endif %}
 }
 
 v8::Local<v8::Value> ToV8(const {{cpp_class}}& impl, v8::Local<v8::Object> creationContext, v8::Isolate* isolate) {
   switch (impl.m_type) {
     case {{cpp_class}}::SpecificTypeNone:
       {# FIXME: We might want to return undefined in some cases #}
       return v8::Null(isolate);
     {% for member in members %}
     case {{cpp_class}}::{{member.specific_type_enum}}:
       return {{member.cpp_value_to_v8_value}};
     {% endfor %}
     default:
       NOTREACHED();
   }
   return v8::Local<v8::Value>();
 }
 
 {{cpp_class}} NativeValueTraits<{{cpp_class}}>::nativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState) {
   {{cpp_class}} impl;
   {{v8_class}}::toImpl(isolate, value, impl, UnionTypeConversionMode::NotNullable, exceptionState);
   return impl;
 }
 
 }  // namespace blink
 
 {% endfilter %}{# format_blink_cpp_source_code #}