[SPv2] Add CSS mask support

third_party/WebKit/Source/core/css/FontFaceSet.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 36 matching lines @@
 namespace blink {
 
 class CSSFontSelector;
 class ExceptionState;
 class Font;
 class FontFaceCache;
 class ExecutionContext;
 
 using FontFaceSetIterable = PairIterable<Member<FontFace>, Member<FontFace>>;
 
-class FontFaceSet final : public EventTargetWithInlineData,
-                          public Supplement<Document>,
-                          public SuspendableObject,
-                          public FontFaceSetIterable,
-                          public FontFace::LoadFontCallback {
+class CORE_EXPORT FontFaceSet final : public EventTargetWithInlineData,
+                                      public Supplement<Document>,
+                                      public SuspendableObject,
+                                      public FontFaceSetIterable,
+                                      public FontFace::LoadFontCallback {
   USING_GARBAGE_COLLECTED_MIXIN(FontFaceSet);
   DEFINE_WRAPPERTYPEINFO();
   WTF_MAKE_NONCOPYABLE(FontFaceSet);
 
  public:
   ~FontFaceSet() override;
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(loading);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(loadingdone);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(loadingerror);
@@ skipping 110 matching lines @@
   HeapListHashSet<Member<FontFace>> m_nonCSSConnectedFaces;
 
   Member<AsyncMethodRunner<FontFaceSet>> m_asyncRunner;
 
   FontLoadHistogram m_histogram;
 };
 
 }  // namespace blink
 
 #endif  // FontFaceSet_h