Avoid unnecessary style recalc for subtree of focused element.

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 3234 matching lines @@
             'animation/AnimationTranslationUtilTest.cpp',
             'animation/CompositorAnimationsTest.cpp',
             'animation/CompositorAnimationsTestHelper.h',
             'animation/CompositorAnimationsTimingFunctionReverserTest.cpp',
             'animation/DocumentTimelineTest.cpp',
             'animation/ElementAnimationTest.cpp',
             'animation/KeyframeEffectModelTest.cpp',
             'animation/PlayerTest.cpp',
             'animation/TimedItemCalculationsTest.cpp',
             'animation/TimedItemTest.cpp',
+            'css/AffectedByFocusTest.cpp',
             'css/CSSCalculationValueTest.cpp',
             'css/CSSTestHelper.cpp',
             'css/CSSTestHelper.h',
             'css/CSSValueTestHelper.h',
             'css/CSSParserValuesTest.cpp',
             'css/CSSValueTestHelper.h',
             'css/HoverUpdateTest.cpp',
             'css/RuleSetTest.cpp',
             'dom/DOMImplementationTest.cpp',
             'dom/DocumentMarkerControllerTest.cpp',
@@ skipping 12 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',
         ],
     }
 }