Introduce DocumentOrShadowRoot Mixin

third_party/WebKit/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 404 matching lines @@
             'workers/WorkerNavigator.idl',
         ],
         # 'partial interface', target (right side of) 'implements', and
         # interfaces with static bindings (in bindings/core/v8/)
         'core_dependency_idl_files': [
             'animation/DocumentAnimation.idl',
             'animation/ElementAnimation.idl',
             'css/DocumentFontFaceSet.idl',
             'dom/ChildNode.idl',
             'dom/DocumentFullscreen.idl',
+            'dom/DocumentOrShadowRoot.idl',
             'dom/ElementFullscreen.idl',
             'dom/GlobalEventHandlers.idl',
             'dom/NonDocumentTypeChildNode.idl',
             'dom/NonElementParentNode.idl',
             'dom/ParentNode.idl',
             'dom/URLUtils.idl',
             'dom/URLUtilsReadOnly.idl',
             'events/EventListener.idl',
             'events/NavigatorEvents.idl',
             'frame/NavigatorCPU.idl',
@@ skipping 1967 matching lines @@
             'dom/DocumentFragment.cpp',
             'dom/DocumentFullscreen.cpp',
             'dom/DocumentFullscreen.h',
             'dom/DocumentInit.cpp',
             'dom/DocumentInit.h',
             'dom/DocumentLifecycle.cpp',
             'dom/DocumentLifecycle.h',
             'dom/DocumentLifecycleNotifier.cpp',
             'dom/DocumentLifecycleNotifier.h',
             'dom/DocumentLifecycleObserver.h',
+            'dom/DocumentOrShadowRoot.h',
             'dom/DocumentOrderedList.cpp',
             'dom/DocumentOrderedList.h',
             'dom/DocumentOrderedMap.cpp',
             'dom/DocumentParser.cpp',
             'dom/DocumentStatisticsCollector.cpp',
             'dom/DocumentStatisticsCollector.h',
             'dom/DocumentStyleSheetCollection.cpp',
             'dom/DocumentStyleSheetCollection.h',
             'dom/DocumentStyleSheetCollector.cpp',
             'dom/DocumentStyleSheetCollector.h',
@@ skipping 1647 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }