Fix JS interop for SkParagraphBuilder.addPlaceholder

lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart

@@ -1485,7 +1485,8 @@ class SkParagraphBuilder {
   external void pushPaintStyle(
       SkTextStyle textStyle, SkPaint foreground, SkPaint background);
   external void pop();
-  external void addPlaceholder(SkPlaceholderStyleProperties placeholderStyle);
+  external void addPlaceholder(double? width, double? height,
+      SkPlaceholderAlignment? alignment, SkTextBaseline? baseline, double? offset);
   external SkParagraph build();
   external void delete();
 }
@@ -1624,6 +1625,12 @@ class SkStrutStyleProperties {
 @JS()
 @anonymous
 class SkPlaceholderStyleProperties {
+  external double? get width;
+  external double? get height;
+  external SkPlaceholderAlignment? get alignment;
+  external double? get offset;
+  external SkTextBaseline? get baseline;
+
   external set width(double? value);
   external set height(double? value);
   external set alignment(SkPlaceholderAlignment? value);

lib/web_ui/lib/src/engine/canvaskit/text.dart

@@ -641,7 +641,13 @@ class CkParagraphBuilder implements ui.ParagraphBuilder {
 
   void _addPlaceholder(SkPlaceholderStyleProperties placeholderStyle) {
     _commands.add(_ParagraphCommand.addPlaceholder(placeholderStyle));
-    _paragraphBuilder.addPlaceholder(placeholderStyle);
+    _paragraphBuilder.addPlaceholder(
+      placeholderStyle.width,
+      placeholderStyle.height,
+      placeholderStyle.alignment,
+      placeholderStyle.baseline,
+      placeholderStyle.offset,
+    );
   }
 
   static SkPlaceholderStyleProperties toSkPlaceholderStyle(