[selectors4] Implement :focus-within pseudo-class

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/StyleChangeReason.h"
 
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "wtf/StaticConstructors.h"
 
 namespace blink {
@@ skipping 34 matching lines @@
 const char kVisuallyOrdered[] = "VisuallyOrdered";
 const char kWritingModeChange[] = "WritingModeChange";
 const char kZoom[] = "Zoom";
 }  // namespace StyleChangeReason
 
 namespace StyleChangeExtraData {
 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);
 
 void Init() {
   DCHECK(IsMainThread());
 
   new (NotNull, (void*)&g_active) AtomicString(":active");
   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");
 }
 
 }  // namespace StyleChangeExtraData
 
 }  // namespace blink