Initial support for experimental touch-action CSS feature

Source/core/rendering/style/RenderStyleConstants.h

Index: Source/core/rendering/style/RenderStyleConstants.h
diff --git a/Source/core/rendering/style/RenderStyleConstants.h b/Source/core/rendering/style/RenderStyleConstants.h
index 32fa4278710dbe90e81577e9cb9e271d0ee1aebe..f92907270fbab44a59c2632a22483d9f1c7f6066 100644
--- a/Source/core/rendering/style/RenderStyleConstants.h
+++ b/Source/core/rendering/style/RenderStyleConstants.h
@@ -495,6 +495,8 @@ enum GridAutoFlow { AutoFlowNone, AutoFlowColumn, AutoFlowRow };
 
 enum DraggableRegionMode { DraggableRegionNone, DraggableRegionDrag, DraggableRegionNoDrag };
 
+enum TouchAction { TouchActionAuto, TouchActionNone };
+
 // Reasonable maximum to prevent insane font sizes from causing crashes on some platforms (such as Windows).
 static const float maximumAllowedFontSize = 1000000.0f;