Lazy Parse CSS

third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.h

Index: third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.h
diff --git a/third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.h b/third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.h
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+// Copyright 2016 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.
+
+#ifndef CSSLazyParsingState_h
+#define CSSLazyParsingState_h
+
+#include "core/css/CSSSelectorList.h"
+#include "core/css/parser/CSSParserMode.h"
+#include "wtf/Vector.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+// This class helps lazy parsing by retaining necessary state. It should not
+// outlive the StyleSheetContents that initiated the parse, as it retains a raw
+// reference to the UseCounter associated with the style sheet.
+class CSSLazyParsingState
+    : public GarbageCollectedFinalized<CSSLazyParsingState> {
+ public:
+  CSSLazyParsingState(const CSSParserContext&,
+                      Vector<String> escapedStrings,
+                      const String& sheetText);
+
+  // This should be a copy of the context used in CSSParser::parseSheet.
+  const CSSParserContext& context() { return m_context; }
+
+  bool shouldLazilyParseProperties(const CSSSelectorList&);
+
+  DEFINE_INLINE_TRACE() {}
+
+ private:
+  CSSParserContext m_context;
+  Vector<String> m_escapedStrings;
+  // Also referenced on the css resource.
+  String m_sheetText;
+};
+
+}  // namespace blink
+
+#endif  // CSSLazyParsingState_h