import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/generic/nsRubyContentFrame.h

@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code is subject to the terms of the Mozilla Public License
+ * version 2.0 (the "License"). You can obtain a copy of the License at
+ * http://mozilla.org/MPL/2.0/. */
+
+/* base class for ruby rendering objects that directly contain content */
+
+#ifndef nsRubyContentFrame_h___
+#define nsRubyContentFrame_h___
+
+#include "nsInlineFrame.h"
+
+class nsRubyContentFrame : public nsInlineFrame
+{
+public:
+  NS_DECL_ABSTRACT_FRAME(nsRubyContentFrame)
+
+  // nsIFrame overrides
+  virtual bool IsFrameOfType(uint32_t aFlags) const override;
+
+  // Indicates whether this is an "intra-level whitespace" frame, i.e.
+  // an anonymous frame that was created to contain non-droppable
+  // whitespaces directly inside a ruby level container. This impacts
+  // ruby pairing behavior.
+  // See http://dev.w3.org/csswg/css-ruby/#anon-gen-interpret-space
+  bool IsIntraLevelWhitespace() const;
+
+protected:
+  explicit nsRubyContentFrame(nsStyleContext* aContext)
+    : nsInlineFrame(aContext) {}
+};
+
+#endif /* nsRubyContentFrame_h___ */