bindings: Define IDLAny and support it in NativeValueTraits

Bug: 839389
Change-Id: I6f4a03b1162f7d465c0f572d032d5fa878df3402
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040497Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738855}

third_party/blink/renderer/bindings/core/v8/idl_types.h

@@ -26,7 +26,10 @@ class ScriptValue;
 // The type names below are named as "IDL" prefix + Web IDL type name.
 // https://heycam.github.io/webidl/#dfn-type-name
 
-// Boolean
+// any
+struct IDLAny final : public IDLBaseHelper<ScriptValue> {};
+
+// boolean
 struct IDLBoolean final : public IDLBaseHelper<bool> {};
 
 // Integer types
@@ -92,11 +95,11 @@ using IDLLongLongEnforceRange =
 using IDLUnsignedLongLongEnforceRange =
     IDLIntegerTypeBase<uint64_t, bindings::IDLIntegerConvMode::kEnforceRange>;
 
-// Float
+// float
 struct IDLFloat final : public IDLBaseHelper<float> {};
 struct IDLUnrestrictedFloat final : public IDLBaseHelper<float> {};
 
-// Double
+// double
 struct IDLDouble final : public IDLBaseHelper<double> {};
 struct IDLUnrestrictedDouble final : public IDLBaseHelper<double> {};
 
@@ -161,10 +164,10 @@ using IDLUSVStringV2 =
 // object
 struct IDLObject final : public IDLBaseHelper<ScriptValue> {};
 
-// Promise
+// Promise types
 struct IDLPromise final : public IDLBaseHelper<ScriptPromise> {};
 
-// Sequence
+// Sequence types
 template <typename T>
 struct IDLSequence final : public IDLBase {
   using ImplType =
@@ -175,7 +178,7 @@ struct IDLSequence final : public IDLBase {
 template <typename T>
 using IDLArray = IDLSequence<T>;
 
-// Record
+// Record types
 template <typename Key, typename Value>
 struct IDLRecord final : public IDLBase {
   static_assert(std::is_same<typename Key::ImplType, String>::value,
@@ -189,7 +192,7 @@ struct IDLRecord final : public IDLBase {
       std::remove_pointer_t<typename NativeValueTraits<Value>::ImplType>>;
 };
 
-// Nullable
+// Nullable types
 template <typename InnerType>
 struct IDLNullable final : public IDLBase {
   using ImplType = std::conditional_t<

third_party/blink/renderer/bindings/core/v8/native_value_traits_impl.h

@@ -58,7 +58,21 @@ CORE_EXPORT ScriptWrappable* NativeValueTraitsInterfaceOrNullArgumentValue(
 
 }  // namespace bindings
 
-// Boolean
+// any
+template <>
+struct CORE_EXPORT NativeValueTraits<IDLAny>
+    : public NativeValueTraitsBase<IDLAny> {
+  static ScriptValue NativeValue(v8::Isolate* isolate,
+                                 v8::Local<v8::Value> value,
+                                 ExceptionState& exception_state) {
+    return ScriptValue(isolate, value);
+  }
+};
+// IDLNullable<IDLAny> must not be used.
+template <>
+struct NativeValueTraits<IDLNullable<IDLAny>>;
+
+// boolean
 template <>
 struct CORE_EXPORT NativeValueTraits<IDLBoolean>
     : public NativeValueTraitsBase<IDLBoolean> {
@@ -441,7 +455,7 @@ struct CORE_EXPORT NativeValueTraits<IDLNullable<IDLObject>>
   }
 };
 
-// Promises
+// Promise types
 template <>
 struct CORE_EXPORT NativeValueTraits<IDLPromise>
     : public NativeValueTraitsBase<IDLPromise> {
@@ -456,7 +470,7 @@ struct CORE_EXPORT NativeValueTraits<IDLPromise>
 template <>
 struct NativeValueTraits<IDLNullable<IDLPromise>>;
 
-// Sequences
+// Sequence types
 template <typename T>
 struct NativeValueTraits<IDLSequence<T>>
     : public NativeValueTraitsBase<IDLSequence<T>> {
@@ -584,7 +598,7 @@ struct NativeValueTraits<IDLSequence<T>>
   }
 };
 
-// Records
+// Record types
 template <typename K, typename V>
 struct NativeValueTraits<IDLRecord<K, V>>
     : public NativeValueTraitsBase<IDLRecord<K, V>> {
@@ -708,7 +722,7 @@ struct NativeValueTraits<IDLRecord<K, V>>
   }
 };
 
-// Callback functions
+// Callback function types
 template <typename T>
 struct NativeValueTraits<
     T,
@@ -728,7 +742,7 @@ struct NativeValueTraits<
   }
 };
 
-// Dictionary
+// Dictionary types
 template <typename T>
 struct NativeValueTraits<
     T,
@@ -742,7 +756,7 @@ struct NativeValueTraits<
   }
 };
 
-// Enumeration
+// Enumeration types
 template <typename T>
 struct NativeValueTraits<
     T,
@@ -756,7 +770,7 @@ struct NativeValueTraits<
   }
 };
 
-// Interface
+// Interface types
 template <typename T>
 struct NativeValueTraits<
     T,
@@ -805,7 +819,7 @@ struct NativeValueTraits<
   }
 };
 
-// Union type
+// Union types
 template <typename T>
 struct NativeValueTraits<
     T,
@@ -818,7 +832,7 @@ struct NativeValueTraits<
   }
 };
 
-// Nullable
+// Nullable types
 template <typename InnerType>
 struct NativeValueTraits<
     IDLNullable<InnerType>,