Make Page Visibility API work when the browser window is visible or not

ui/wm/core/focus_controller.cc

Index: ui/wm/core/focus_controller.cc
diff --git a/ui/wm/core/focus_controller.cc b/ui/wm/core/focus_controller.cc
index 446e82c269fc4e852491886d1207ecfeaddc93cf..287e02dc1520814c728e745105def9a5f295af0e 100644
--- a/ui/wm/core/focus_controller.cc
+++ b/ui/wm/core/focus_controller.cc
@@ -178,7 +178,8 @@ void FocusController::OnGestureEvent(ui::GestureEvent* event) {
 // FocusController, aura::WindowObserver implementation:
 
 void FocusController::OnWindowVisibilityChanged(aura::Window* window,
-                                                bool visible) {
+                                                bool visible,
+                                                bool content_visible) {
   if (!visible)
     WindowLostFocusFromDispositionChange(window, window->parent());
 }