fix(Page.select): synthesized events should bubble

This patch fixes `Page.select` to synthesize bubbling events.

test/assets/input/select.html

@@ -25,6 +25,8 @@
       window.result = {
         onInput: null,
         onChange: null,
+        onBubblingChange: null,
+        onBubblingInput: null,
       };
 
       let select = document.querySelector('select');
@@ -50,6 +52,18 @@
           return option.value;
         });
       }, false);
+
+      document.body.addEventListener('input', () => {
+        result.onBubblingInput = Array.from(select.querySelectorAll('option:checked')).map((option) => {
+          return option.value;
+        });
+      }, false);
+
+      document.body.addEventListener('change', () => {
+        result.onBubblingChange = Array.from(select.querySelectorAll('option:checked')).map((option) => {
+          return option.value;
+        });
+      }, false);
     </script>
   </body>
 </html>