[selectors4] Implement :focus-within pseudo-class

third_party/WebKit/Source/core/dom/StyleChangeReason.cpp

Index: third_party/WebKit/Source/core/dom/StyleChangeReason.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleChangeReason.cpp b/third_party/WebKit/Source/core/dom/StyleChangeReason.cpp
index fc1fd16853829e3b5a108b4842cad81d2dd9f802..dd7270cb5ec21c7c0becc97e99c0e282812172ef 100644
--- a/third_party/WebKit/Source/core/dom/StyleChangeReason.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleChangeReason.cpp
@@ -52,6 +52,7 @@ DEFINE_GLOBAL(AtomicString, g_active);
 DEFINE_GLOBAL(AtomicString, g_disabled);
 DEFINE_GLOBAL(AtomicString, g_drag);
 DEFINE_GLOBAL(AtomicString, g_focus);
+DEFINE_GLOBAL(AtomicString, g_focus_within);
 DEFINE_GLOBAL(AtomicString, g_hover);
 DEFINE_GLOBAL(AtomicString, g_past);
 DEFINE_GLOBAL(AtomicString, g_unresolved);
@@ -63,6 +64,7 @@ void Init() {
   new (NotNull, (void*)&g_disabled) AtomicString(":disabled");
   new (NotNull, (void*)&g_drag) AtomicString(":-webkit-drag");
   new (NotNull, (void*)&g_focus) AtomicString(":focus");
+  new (NotNull, (void*)&g_focus_within) AtomicString(":focus-within");
   new (NotNull, (void*)&g_hover) AtomicString(":hover");
   new (NotNull, (void*)&g_past) AtomicString(":past");
   new (NotNull, (void*)&g_unresolved) AtomicString(":unresolved");