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

ui/wm/core/focus_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/wm/core/focus_controller.h"
 
 #include "base/auto_reset.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/focus_change_observer.h"
@@ skipping 160 matching lines @@
       event->details().touch_points() == 1 &&
       !event->handled()) {
     WindowFocusedFromInputEvent(static_cast<aura::Window*>(event->target()));
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // FocusController, aura::WindowObserver implementation:
 
 void FocusController::OnWindowVisibilityChanged(aura::Window* window,
-                                                bool visible) {
+                                                bool visible,
+                                                bool content_visible) {
   if (!visible)
     WindowLostFocusFromDispositionChange(window, window->parent());
 }
 
 void FocusController::OnWindowDestroying(aura::Window* window) {
   // A window's modality state will interfere with focus restoration during its
   // destruction.
   window->ClearProperty(aura::client::kModalKey);
   WindowLostFocusFromDispositionChange(window, window->parent());
 }
@@ skipping 154 matching lines @@
 
 void FocusController::WindowFocusedFromInputEvent(aura::Window* window) {
   // Only focus |window| if it or any of its parents can be focused. Otherwise
   // FocusWindow() will focus the topmost window, which may not be the
   // currently focused one.
   if (rules_->CanFocusWindow(GetToplevelWindow(window)))
     FocusWindow(window);
 }
 
 }  // namespace wm