Move custom element code to core/dom/custom/

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSKeyframeRule.idl',
@@ skipping 1760 matching lines @@
             'dom/ContainerNode.cpp',
             'dom/ContainerNodeAlgorithms.cpp',
             'dom/ContainerNodeAlgorithms.h',
             'dom/ContextFeatures.cpp',
             'dom/ContextFeatures.h',
             'dom/ContextLifecycleNotifier.cpp',
             'dom/ContextLifecycleNotifier.h',
             'dom/ContextLifecycleObserver.cpp',
             'dom/ContextLifecycleObserver.h',
             'dom/CrossThreadTask.h',
-            'dom/CustomElement.cpp',
-            'dom/CustomElement.h',
-            'dom/CustomElementCallbackDispatcher.cpp',
-            'dom/CustomElementCallbackDispatcher.h',
-            'dom/CustomElementCallbackInvocation.cpp',
-            'dom/CustomElementCallbackInvocation.h',
-            'dom/CustomElementCallbackQueue.cpp',
-            'dom/CustomElementCallbackQueue.h',
-            'dom/CustomElementCallbackScheduler.cpp',
-            'dom/CustomElementCallbackScheduler.h',
-            'dom/CustomElementDefinition.cpp',
-            'dom/CustomElementDefinition.h',
-            'dom/CustomElementDescriptor.h',
-            'dom/CustomElementDescriptorHash.h',
-            'dom/CustomElementException.cpp',
-            'dom/CustomElementException.h',
-            'dom/CustomElementLifecycleCallbacks.h',
-            'dom/CustomElementObserver.cpp',
-            'dom/CustomElementObserver.h',
-            'dom/CustomElementRegistrationContext.cpp',
-            'dom/CustomElementRegistrationContext.h',
-            'dom/CustomElementRegistry.cpp',
-            'dom/CustomElementRegistry.h',
-            'dom/CustomElementUpgradeCandidateMap.cpp',
-            'dom/CustomElementUpgradeCandidateMap.h',
             'dom/DatasetDOMStringMap.cpp',
             'dom/DatasetDOMStringMap.h',
             'dom/DataTransferItem.cpp',
             'dom/DataTransferItem.h',
             'dom/DataTransferItemList.cpp',
             'dom/DataTransferItemList.h',
             'dom/DecodedDataDocumentParser.cpp',
             'dom/DecodedDataDocumentParser.h',
             'dom/DeviceOrientationController.cpp',
             'dom/DeviceOrientationController.h',
@@ skipping 114 matching lines @@
             'dom/ScriptedAnimationController.cpp',
             'dom/ScriptedAnimationController.h',
             'dom/ScriptExecutionContext.cpp',
             'dom/ScriptLoader.cpp',
             'dom/ScriptLoader.h',
             'dom/ScriptRunner.cpp',
             'dom/SecurityContext.cpp',
             'dom/SecurityContext.h',
             'dom/SelectorQuery.cpp',
             'dom/SelectorQuery.h',
+            'dom/custom/CustomElement.cpp',
+            'dom/custom/CustomElement.h',
+            'dom/custom/CustomElementCallbackDispatcher.cpp',
+            'dom/custom/CustomElementCallbackDispatcher.h',
+            'dom/custom/CustomElementCallbackInvocation.cpp',
+            'dom/custom/CustomElementCallbackInvocation.h',
+            'dom/custom/CustomElementCallbackQueue.cpp',
+            'dom/custom/CustomElementCallbackQueue.h',
+            'dom/custom/CustomElementCallbackScheduler.cpp',
+            'dom/custom/CustomElementCallbackScheduler.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/CustomElementObserver.cpp',
+            'dom/custom/CustomElementObserver.h',
+            'dom/custom/CustomElementRegistrationContext.cpp',
+            'dom/custom/CustomElementRegistrationContext.h',
+            'dom/custom/CustomElementRegistry.cpp',
+            'dom/custom/CustomElementRegistry.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',
             'dom/shadow/InsertionPoint.cpp',
             'dom/shadow/InsertionPoint.h',
             'dom/shadow/SelectRuleFeatureSet.cpp',
             'dom/shadow/SelectRuleFeatureSet.h',
@@ skipping 1878 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }