Adds filter support for offscreen canvas

third_party/WebKit/Source/core/style/ComputedStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 365 matching lines @@
         m_nonInheritedData.m_isLink = false;
         m_nonInheritedData.m_hasRemUnits = false;
 
         // All independently inherited properties default to being inherited.
         m_nonInheritedData.m_isPointerEventsInherited = true;
         m_nonInheritedData.m_isVisibilityInherited = true;
     }
 
 private:
     // TODO(sashab): Move these to the bottom of ComputedStyle.
-    ALWAYS_INLINE ComputedStyle();
+    ComputedStyle();
 
     enum InitialStyleTag {
         InitialStyle
     };
-    ALWAYS_INLINE explicit ComputedStyle(InitialStyleTag);
-    ALWAYS_INLINE ComputedStyle(const ComputedStyle&);
+    explicit ComputedStyle(InitialStyleTag);
+    ComputedStyle(const ComputedStyle&);
 
     static PassRefPtr<ComputedStyle> createInitialStyle();
-    static inline ComputedStyle& mutableInitialStyle()
+    static ComputedStyle& mutableInitialStyle()
     {
         LEAK_SANITIZER_DISABLED_SCOPE;
-        DEFINE_STATIC_REF(ComputedStyle, s_initialStyle, (ComputedStyle::createInitialStyle()));
-        return *s_initialStyle;
+
+        DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<ComputedStyle*>, s_initialStyle,
+            new ThreadSpecific<ComputedStyle*>());

[esprehn, 2016/09/12 20:53:12]

Can't put TLS here, it's too slow

+        if (!*s_initialStyle) {
+            *s_initialStyle = PassRefPtr<ComputedStyle>(ComputedStyle::createInitialStyle()).leakRef();
+        }
+        return **s_initialStyle;
     }
 
 public:
     static PassRefPtr<ComputedStyle> create();
     static PassRefPtr<ComputedStyle> createAnonymousStyleWithDisplay(const ComputedStyle& parentStyle, EDisplay);
     static PassRefPtr<ComputedStyle> clone(const ComputedStyle&);
     static const ComputedStyle& initialStyle() { return mutableInitialStyle(); }
     static void invalidateInitialStyle();
 
     // Computes how the style change should be propagated down the tree.
@@ skipping 2203 matching lines @@
 }
 
 inline bool ComputedStyle::hasPseudoElementStyle() const
 {
     return m_nonInheritedData.m_pseudoBits & ElementPseudoIdMask;
 }
 
 } // namespace blink
 
 #endif // ComputedStyle_h