Create a new local context class.

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

Index: third_party/WebKit/Source/core/css/parser/CSSParserLocalContext.h
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserLocalContext.h b/third_party/WebKit/Source/core/css/parser/CSSParserLocalContext.h
new file mode 100644
index 0000000000000000000000000000000000000000..761f20d7f1246321fc56d4f443c30558e95058ba
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserLocalContext.h
@@ -0,0 +1,29 @@
+// Copyright 2017 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 CSSParserLocalContext_h
+#define CSSParserLocalContext_h
+
+#include "platform/wtf/Allocator.h"
+
+namespace blink {
+
+// A wrapper class containing all local context when parsing a property.
+// TODO(jiameng): add info for shorthand properties into this class.
+
+class CSSParserLocalContext {
+  STACK_ALLOCATED();
+
+ public:
+  CSSParserLocalContext();
+  explicit CSSParserLocalContext(bool);

[meade_UTC10, 2017/05/26 00:29:23]

I'd keep the name of the bool here for clarity. The style guide only says to
remove the name if it doesn't add any information.

+  bool GetUseAliasParsing();
+
+ private:
+  bool use_alias_parsing_;
+};
+
+}  // namespace blink
+
+#endif  // CSSParserLocalContext_h