Tidy DEFINE_(THREAD_SAFE_)STATIC_LOCAL() implementations.

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
@@ skipping 128 matching lines @@
   return ruleSetsCustomProperty;
 }
 
 }  // namespace
 
 using namespace HTMLNames;
 
 ComputedStyle* StyleResolver::s_styleNotYetAvailable;
 
 static StylePropertySet* leftToRightDeclaration() {
+  // |MutableStylePropertySet::m_cssomWrapper| is a |ScriptWrappable|,
+  // which must not leak between contexts via this singleton. That
+  // cannot happen as that field will not be instantiated for this
+  // particular singleton. Turn off the verification check.
   DEFINE_STATIC_LOCAL(MutableStylePropertySet, leftToRightDecl,

[haraken, 2017/02/11 10:25:20]

Ditto. If there's a way to avoid using DEFINE_STATIC_LOCAL, that should be
better.

-                      (MutableStylePropertySet::create(HTMLQuirksMode)));
+                      (MutableStylePropertySet::create(HTMLQuirksMode)),
+                      CheckScriptWrappable::No);
   if (leftToRightDecl.isEmpty())
     leftToRightDecl.setProperty(CSSPropertyDirection, CSSValueLtr);
   return &leftToRightDecl;
 }
 
 static StylePropertySet* rightToLeftDeclaration() {
+  // See |leftToRightDeclaration()| comment on why |CheckScriptWrappable::No|
+  // is used.
   DEFINE_STATIC_LOCAL(MutableStylePropertySet, rightToLeftDecl,
-                      (MutableStylePropertySet::create(HTMLQuirksMode)));
+                      (MutableStylePropertySet::create(HTMLQuirksMode)),
+                      CheckScriptWrappable::No);
   if (rightToLeftDecl.isEmpty())
     rightToLeftDecl.setProperty(CSSPropertyDirection, CSSValueRtl);
   return &rightToLeftDecl;
 }
 
 static void collectScopedResolversForHostedShadowTrees(
     const Element& element,
     HeapVector<Member<ScopedStyleResolver>, 8>& resolvers) {
   ElementShadow* shadow = element.shadow();
   if (!shadow)
@@ skipping 1764 matching lines @@
 
 DEFINE_TRACE(StyleResolver) {
   visitor->trace(m_matchedPropertiesCache);
   visitor->trace(m_selectorFilter);
   visitor->trace(m_styleSharingLists);
   visitor->trace(m_document);
   visitor->trace(m_tracker);
 }
 
 }  // namespace blink