Expose baseline information in the Sky API.

sky/engine/core/dom/Element.idl

Index: sky/engine/core/dom/Element.idl
diff --git a/sky/engine/core/dom/Element.idl b/sky/engine/core/dom/Element.idl
index 02a917a21a72ee5e3d7c82caad948ecf418f06f0..126f0c5d5ea0e30c1119d49aebd5b76607352a3a 100644
--- a/sky/engine/core/dom/Element.idl
+++ b/sky/engine/core/dom/Element.idl
@@ -50,6 +50,8 @@
   attribute double height;
   attribute double minContentWidth; // Intrinsic width if all wrappable points wrap.
   attribute double maxContentWidth; // Intrinsic width if no wrappable points wrap.
+  readonly attribute double alphabeticBaseline; // Distance from top to alphabetic baseline of first line
+  readonly attribute double ideographicBaseline; // Distance from top to ideographic baseline of first line
 
   void paint(Canvas canvas);
 };