Implement RenderEditable.computeDryBaseline (#147911)

Missed `RenderEditable` so flutter/flutter#146224 is failing in google3

Author: LongCatIsLooong

packages/flutter/lib/src/rendering/editable.dart

@@ -2302,6 +2302,15 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin,
     return Size(width, constraints.constrainHeight(_preferredHeight(constraints.maxWidth)));
   }
 
+  @override
+  double computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
+    final (double minWidth, double maxWidth) = _adjustConstraints(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
+    _textIntrinsics
+      ..setPlaceholderDimensions(layoutInlineChildren(constraints.maxWidth, ChildLayoutHelper.dryLayoutChild, ChildLayoutHelper.getDryBaseline))
+      ..layout(minWidth: minWidth, maxWidth: maxWidth);
+    return _textIntrinsics.computeDistanceToActualBaseline(baseline);
+  }
+
   @override
   void performLayout() {
     final BoxConstraints constraints = this.constraints;