Consider slots as a focus scope

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 2603 matching lines @@
             'dom/custom/CustomElementRegistrationContext.cpp',
             'dom/custom/CustomElementRegistrationContext.h',
             'dom/custom/CustomElementRegistry.cpp',
             'dom/custom/CustomElementRegistry.h',
             'dom/custom/CustomElementScheduler.cpp',
             'dom/custom/CustomElementScheduler.h',
             'dom/custom/CustomElementSyncMicrotaskQueue.cpp',
             'dom/custom/CustomElementSyncMicrotaskQueue.h',
             'dom/custom/CustomElementUpgradeCandidateMap.cpp',
             'dom/custom/CustomElementUpgradeCandidateMap.h',
+            'dom/shadow/AssignedElementTraversal.cpp',
+            'dom/shadow/AssignedElementTraversal.h',

[hayato, 2016/03/03 05:42:21]

Nit: How about renaming this to SlotAssignedSubtreesTraversal?

[yuzuchan, 2016/03/04 03:48:36]

I changed the name to SlotScopedTraversal to shorten it.

[kochi, 2016/03/04 04:16:30]

Sounds good.

             'dom/shadow/DistributedNodes.cpp',
             'dom/shadow/DistributedNodes.h',
             'dom/shadow/ElementShadow.cpp',
             'dom/shadow/ElementShadow.h',
             'dom/shadow/FlatTreeTraversal.cpp',
             'dom/shadow/FlatTreeTraversal.h',
             'dom/shadow/InsertionPoint.cpp',
             'dom/shadow/InsertionPoint.h',
             'dom/shadow/SelectRuleFeatureSet.cpp',
             'dom/shadow/SelectRuleFeatureSet.h',
@@ skipping 1414 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }