[bindings] Introduce ScriptValue.to<T> to convert to native values.

Source/bindings/core/v8/v8.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
     'includes': [
         'custom/custom.gypi',
         '../../modules/v8/generated.gypi',
     ],
     'variables': {
@@ skipping 22 matching lines @@
             'ExceptionMessages.cpp',
             'ExceptionMessages.h',
             'ExceptionState.cpp',
             'ExceptionState.h',
             'ExceptionStatePlaceholder.cpp',
             'ExceptionStatePlaceholder.h',
             'Iterable.h',
             'Maplike.h',
             'ModuleProxy.cpp',
             'ModuleProxy.h',
+            'NativeValueTraits.h',
             'NPV8Object.cpp',
             'NPV8Object.h',
             'Nullable.h',
             'OnStackObjectChecker.cpp',
             'OnStackObjectChecker.h',
             'PageScriptDebugServer.cpp',
             'PageScriptDebugServer.h',
             'PostMessage.h',
             'PrivateScriptRunner.cpp',
             'PrivateScriptRunner.h',
@@ skipping 139 matching lines @@
             'ScriptPromiseResolverTest.cpp',
             'ScriptPromiseTest.cpp',
             'ScriptStreamerTest.cpp',
             'SerializedScriptValueTest.cpp',
             'ToV8Test.cpp',
             'V8BindingTest.cpp',
             'V8ScriptRunnerTest.cpp',
         ],
     },
 }