Update hover state after entering and leaving fullscreen.

LayoutTests/fullscreen/resources/touch-hover-active-tests.js

 function getHoverActiveState(e)
 {
     var states = {
         "rgb(0, 0, 255)": "default",
         "rgb(0, 255, 0)": "active",
         "rgb(255, 0, 0)": "hovered",
         "rgb(255, 255, 0)": "hoveredAndActive"
     };
 
     var color = window.getComputedStyle(e).backgroundColor;
     var result = states[color];
     if (!result)
         result = "unknown: " + color;
     return result;
 }
 
 function elementCenter(e)
 {
     return {
         x: e.offsetLeft + e.offsetWidth / 2,
         y: e.offsetTop + e.offsetHeight / 2
     }
 }
 
 function shouldBeDefault(e) { shouldBeEqualToString(e, "default"); }
 function shouldBeOnlyActive(e) { shouldBeEqualToString(e, "active"); }
 function shouldBeOnlyHovered(e) { shouldBeEqualToString(e, "hovered"); }
 function shouldBeHoveredAndActive(e) { shouldBeEqualToString(e, "hoveredAndActive"); }