[WIP] Implement :dir()

third_party/WebKit/Source/core/dom/ElementData.h

Index: third_party/WebKit/Source/core/dom/ElementData.h
diff --git a/third_party/WebKit/Source/core/dom/ElementData.h b/third_party/WebKit/Source/core/dom/ElementData.h
index 6f7d43770fd4cc05e8ff0b264f96ed75448565e4..9ba2991f9d130038d025b8e1680974cfe4d75dc7 100644
--- a/third_party/WebKit/Source/core/dom/ElementData.h
+++ b/third_party/WebKit/Source/core/dom/ElementData.h
@@ -44,6 +44,15 @@ class ShareableElementData;
 class StylePropertySet;
 class UniqueElementData;
 
+enum class CachedTextDirection {
+    NotAutoOrNotCached,
+    AutoLTR,
+    AutoRTL,
+    // This should also have a state like AutoInherit as it is possible for
+    // an element with dir=auto to end up inheriting its parent's directionality
+    // but we currently don't handle that correctly.
+};
+
 // ElementData represents very common, but not necessarily unique to an element,
 // data such as attributes, inline style, and parsed class names and ids.
 class ElementData : public GarbageCollectedFinalized<ElementData> {
@@ -72,6 +81,9 @@ public:
 
     bool isUnique() const { return m_isUnique; }
 
+    CachedTextDirection directionality() const { return static_cast<CachedTextDirection>(m_directionality); }
+    void setDirectionality(CachedTextDirection directionality) const { m_directionality = static_cast<int>(directionality); }
+
     DECLARE_TRACE_AFTER_DISPATCH();
     DECLARE_TRACE();
 
@@ -82,7 +94,8 @@ protected:
 
     // Keep the type in a bitfield instead of using virtual destructors to avoid adding a vtable.
     unsigned m_isUnique : 1;
-    unsigned m_arraySize : 28;
+    unsigned m_arraySize : 26;
+    mutable unsigned m_directionality : 2;
     mutable unsigned m_presentationAttributeStyleIsDirty : 1;
     mutable unsigned m_styleAttributeIsDirty : 1;
     mutable unsigned m_animatedSVGAttributesAreDirty : 1;