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Instead of having every single embedder implement keyboard scrolling, handle it in script in the default key event handler. This allows properly targeting the scroll events to their scroll containers as well as appropriately sizing "page up" and "page down" scroll deltas. This change means that when you use the keyboard to scroll, the focused or most recently clicked `<iframe>` or overflow scroll container is scrolled, rather than the main frame. In addition, when a particular scroll frame is larger than its content in the axis of the scroll, the scrolling operation is chained to the parent (as in other browsers). One exception is for `<iframe>`s, which will be implemented in a followup change. Testing: automated tests runnable locally with `mach test-wpt --product servodriver` Signed-off-by: Martin Robinson <mrobinson@igalia.com> Co-authored-by: Martin Robinson <mrobinson@igalia.com>