Add some timeout for UI update

Test expected the spinner to be shown right after performing
web click. If system is busy or device performance is poor, the
UI may not be displayed soon after clicking. Thus, add some
timeout to wait for the UI being updated to deflake the test.

Bug: 213019023
Test: atest CaptivePortalLoginTests
Change-Id: I1d0aee88c7bfab0adae43b4d88846cd4d1f671f1
1 file changed