Make DOM geometry structs serializable (#38828)

Makes the following DOM geometry structs serializable:
- `DOMRect`
- `DOMRectReadOnly`
- `DOMQuad`
- `DOMMatrix`
- `DOMMatrixReadOnly`

Testing: Covered by WPT (`css/geometry/structured-serialization.html`).

---------

Signed-off-by: lumiscosity <averyrudelphe@gmail.com>

components/script_bindings/webidls/DOMMatrix.webidl

@@ -5,7 +5,8 @@
 // https://drafts.fxtf.org/geometry/#dommatrix
 
 [Exposed=(Window,Worker,PaintWorklet),
- LegacyWindowAlias=(SVGMatrix,WebKitCSSMatrix)]
+ LegacyWindowAlias=(SVGMatrix,WebKitCSSMatrix),
+ Serializable]
 interface DOMMatrix : DOMMatrixReadOnly {
     [Throws] constructor(optional (DOMString or sequence<unrestricted double>) init);
 

components/script_bindings/webidls/DOMMatrixReadOnly.webidl

@@ -10,7 +10,8 @@
  * related or neighboring rights to this work.
  */
 
-[Exposed=(Window,Worker,PaintWorklet)]
+[Exposed=(Window,Worker,PaintWorklet),
+ Serializable]
 interface DOMMatrixReadOnly {
     [Throws] constructor(optional (DOMString or sequence<unrestricted double>) init);
 

components/script_bindings/webidls/DOMQuad.webidl

@@ -10,7 +10,8 @@
  * related or neighboring rights to this work.
  */
 
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker),
+ Serializable]
 interface DOMQuad {
     [Throws] constructor(optional DOMPointInit p1 = {}, optional DOMPointInit p2 = {},
                 optional DOMPointInit p3 = {}, optional DOMPointInit p4 = {});

components/script_bindings/webidls/DOMRect.webidl

@@ -5,7 +5,7 @@
 // https://drafts.fxtf.org/geometry/#domrect
 
 [Exposed=(Window,Worker),
- /*Serializable,*/
+ Serializable,
  LegacyWindowAlias=SVGRect]
 interface DOMRect : DOMRectReadOnly {
     [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,

components/script_bindings/webidls/DOMRectReadOnly.webidl

@@ -5,7 +5,7 @@
 // https://drafts.fxtf.org/geometry/#domrect
 
 [Exposed=(Window,Worker),
- /*Serializable*/]
+ Serializable]
 interface DOMRectReadOnly {
   [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
               optional unrestricted double width = 0, optional unrestricted double height = 0);