script: Minimize layout queries for window scroll offsets. (#38018)

These changes reduce the number of times we need to query layout for the
same information when creating mouse/pointer events.

Testing: No new tests required for maintaining existing behaviour.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script_bindings/codegen/Bindings.conf

@@ -488,7 +488,7 @@ DOMInterfaces = {
 },
 
 'MouseEvent': {
-    'canGc': ['OffsetX', 'OffsetY'],
+    'canGc': ['InitMouseEvent', 'OffsetX', 'OffsetY'],
 },
 
 'NavigationPreloadManager': {
@@ -649,6 +649,10 @@ DOMInterfaces = {
     'additionalTraits': ['crate::interfaces::WebGL2RenderingContextHelpers'],
 },
 
+'WheelEvent': {
+    'canGc': ['InitWheelEvent'],
+},
+
 'Window': {
     'canGc': ['Stop', 'Fetch', 'Scroll', 'Scroll_','ScrollBy', 'ScrollBy_', 'Stop', 'Fetch', 'Open', 'CreateImageBitmap', 'CreateImageBitmap_', 'TrustedTypes', 'WebdriverCallback', 'WebdriverException'],
     'inRealms': ['Fetch', 'GetOpener', 'WebdriverCallback', 'WebdriverException'],