Separate Custom Element resolution and upgrade/createdCallback.

Source/core/core.gypi

 {
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/Player.idl',
             'animation/TimedItem.idl',
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
@@ skipping 2019 matching lines @@
             'dom/custom/CustomElementCallbackInvocation.h',
             'dom/custom/CustomElementCallbackQueue.cpp',
             'dom/custom/CustomElementCallbackQueue.h',
             'dom/custom/CustomElementDefinition.cpp',
             'dom/custom/CustomElementDefinition.h',
             'dom/custom/CustomElementDescriptor.h',
             'dom/custom/CustomElementDescriptorHash.h',
             'dom/custom/CustomElementException.cpp',
             'dom/custom/CustomElementException.h',
             'dom/custom/CustomElementLifecycleCallbacks.h',
-            'dom/custom/CustomElementMicrotaskElementStep.cpp',
-            'dom/custom/CustomElementMicrotaskElementStep.h',
+            'dom/custom/CustomElementMicrotaskDispatcher.cpp',
+            'dom/custom/CustomElementMicrotaskDispatcher.h',
             'dom/custom/CustomElementMicrotaskImportStep.cpp',
             'dom/custom/CustomElementMicrotaskImportStep.h',
             'dom/custom/CustomElementMicrotaskQueue.cpp',
             'dom/custom/CustomElementMicrotaskQueue.h',
+            'dom/custom/CustomElementMicrotaskResolutionStep.cpp',
+            'dom/custom/CustomElementMicrotaskResolutionStep.h',
             'dom/custom/CustomElementMicrotaskStep.h',
             'dom/custom/CustomElementObserver.cpp',
             'dom/custom/CustomElementObserver.h',
             'dom/custom/CustomElementProcessingStep.h',
             'dom/custom/CustomElementRegistrationContext.cpp',
             'dom/custom/CustomElementRegistrationContext.h',
             'dom/custom/CustomElementRegistry.cpp',
             'dom/custom/CustomElementRegistry.h',
-            'dom/custom/CustomElementResolutionStep.cpp',
-            'dom/custom/CustomElementResolutionStep.h',
             'dom/custom/CustomElementScheduler.cpp',
             'dom/custom/CustomElementScheduler.h',
             'dom/custom/CustomElementUpgradeCandidateMap.cpp',
             'dom/custom/CustomElementUpgradeCandidateMap.h',
             'dom/shadow/ComposedTreeWalker.cpp',
             'dom/shadow/ComposedTreeWalker.h',
             'dom/shadow/ContentDistribution.cpp',
             'dom/shadow/ContentDistribution.h',
             'dom/shadow/ElementShadow.cpp',
             'dom/shadow/ElementShadow.h',
@@ skipping 1199 matching lines @@
             'html/parser/HTMLParserThreadTest.cpp',
             'html/track/vtt/BufferedLineReaderTest.cpp',
             'html/track/vtt/VTTScannerTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
         ],
     }
 }