style: Flush parent document layout if needed for viewport dependent media queries

This is necessary to properly report changes in our document.

The remaining failures are about change event scheduling, which is a
pre-existing issue. Will fix, but in a separate bug.

Differential Revision: https://phabricator.services.mozilla.com/D178917

components/style/queries/feature.rs

@@ -118,6 +118,8 @@ bitflags! {
         const CONTAINER_REQUIRES_WIDTH_AXIS = 1 << 4;
         /// The feature requires containment in the physical height axis.
         const CONTAINER_REQUIRES_HEIGHT_AXIS = 1 << 5;
+        /// The feature evaluation depends on the viewport size.
+        const VIEWPORT_DEPENDENT = 1 << 6;
     }
 }