bindings: Add C++ versions of WebIDL types and generalize NativeValueTraits.

third_party/WebKit/Source/bindings/core/v8/V8Binding.h

Index: third_party/WebKit/Source/bindings/core/v8/V8Binding.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Binding.h b/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
index 1df7fae7726c68025efbae99fb7607a1ef7a794a..f61a6e961da0f0c0c72c713e9898f3e9fd0ab001 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
@@ -40,6 +40,7 @@
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "bindings/core/v8/SerializedScriptValue.h"
 #include "bindings/core/v8/V8BindingMacros.h"
 #include "bindings/core/v8/V8PerIsolateData.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
@@ -761,12 +762,12 @@ HeapVector<Member<T>> toMemberNativeArray(v8::Local<v8::Value> value,
 
 // Converts a JavaScript value to an array as per the Web IDL specification:
 // http://www.w3.org/TR/2012/CR-WebIDL-20120419/#es-array
-template <typename VectorType>
+template <typename VectorType,
+          typename ValueType = typename VectorType::ValueType>
 VectorType toImplArray(v8::Local<v8::Value> value,
                        int argumentIndex,
                        v8::Isolate* isolate,
                        ExceptionState& exceptionState) {
-  typedef typename VectorType::ValueType ValueType;
   typedef NativeValueTraits<ValueType> TraitsType;
 
   uint32_t length = 0;
@@ -904,6 +905,22 @@ inline bool toV8Sequence(v8::Local<v8::Value> value,
 }
 
 template <>
+struct NativeValueTraits<SerializedScriptValue>

[haraken, 2017/03/06 19:10:29]

Yeah, I'd prefer moving this to SerializedScriptValue.h. All type specialization
in this file should be gone.

[Raphael Kubo da Costa (rakuco), 2017/03/06 19:40:48]

Done in patch v6 \o/

+    : public NativeValueTraitsBase<SerializedScriptValue> {
+  CORE_EXPORT static inline PassRefPtr<SerializedScriptValue> nativeValue(
+      v8::Isolate* isolate,
+      v8::Local<v8::Value> value,
+      ExceptionState& exceptionState) {
+    return SerializedScriptValue::serialize(isolate, value, nullptr, nullptr,
+                                            exceptionState);
+  }
+};
+
+// TODO(rakuco): remove the specializations below (and consequently the
+// non-IDLBase version of NativeValueTraitsBase) once we manage to convert all
+// uses of NativeValueTraits to types that derive from IDLBase or for generated
+// IDL interfaces/dictionaries/unions.
+template <>
 struct NativeValueTraits<String> {
   static inline String nativeValue(v8::Isolate* isolate,
                                    v8::Local<v8::Value> value,