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

third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.h

Index: third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.h
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.h b/third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.h
index 28ab63f0f1d0cedb89acb790e84a478cb0a234e1..77b5092dcfed85869dbfd4c2ce7f6d7a84b32e02 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.h
+++ b/third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.h
@@ -13,6 +13,7 @@
 #ifndef StringSequenceCallbackFunctionLongSequenceArg_h
 #define StringSequenceCallbackFunctionLongSequenceArg_h
 
+#include "bindings/core/v8/NativeValueTraits.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/TraceWrapperV8Reference.h"
 #include "core/CoreExport.h"
@@ -45,6 +46,12 @@ class CORE_EXPORT StringSequenceCallbackFunctionLongSequenceArg final : public G
   TraceWrapperV8Reference<v8::Function> m_callback;
 };
 
+template <>
+struct NativeValueTraits<StringSequenceCallbackFunctionLongSequenceArg> {
+  using ImplType = StringSequenceCallbackFunctionLongSequenceArg;
+  CORE_EXPORT static StringSequenceCallbackFunctionLongSequenceArg* nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+};
+
 }  // namespace blink
 
 #endif  // StringSequenceCallbackFunctionLongSequenceArg_h