Add <link rel=preconnect> crossorigin attribute (take 2)

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 2517 matching lines @@
             'events/UIEvent.cpp',
             'events/UIEventWithKeyState.cpp',
             'events/WheelEvent.cpp',
             'events/WheelEvent.h',
             'events/WindowEventContext.cpp',
             'events/WindowEventContext.h',
         ],
         'webcore_html_files': [
             'html/ClassList.cpp',
             'html/ClassList.h',
+            'html/CrossOriginAttribute.cpp',
+            'html/CrossOriginAttribute.h',
             'html/DOMFormData.cpp',
             'html/DOMFormData.h',
             'html/DocumentNameCollection.cpp',
             'html/DocumentNameCollection.h',
             'html/FormAssociatedElement.cpp',
             'html/FormDataList.cpp',
             'html/FormDataList.h',
             'html/HTMLAllCollection.cpp',
             'html/HTMLAllCollection.h',
             'html/HTMLAnchorElement.cpp',
@@ skipping 1341 matching lines @@
             'style/ComputedStyleTest.cpp',
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }