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

content/browser/web_contents/web_contents_view_aura.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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/metrics/histogram.h"
@@ skipping 1592 matching lines @@
       event.location(),
       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   current_drop_data_.reset();
   return ConvertFromWeb(current_drag_op_);
 }
 
 void WebContentsViewAura::OnWindowVisibilityChanged(aura::Window* window,
-                                                    bool visible) {
+                                                    bool visible,
+                                                    bool content_visible) {
   // Ignore any visibility changes in the hierarchy below.
   if (window != window_.get() && window_->Contains(window))
     return;
 
-  UpdateWebContentsVisibility(visible);
+  UpdateWebContentsVisibility(visible, content_visible);
 }
 
-void WebContentsViewAura::UpdateWebContentsVisibility(bool visible) {
+void WebContentsViewAura::UpdateWebContentsVisibility(bool visible,
+                                                      bool content_visible) {
   if (!is_or_was_visible_) {
     // We should not hide the web contents before it was shown the first time,
     // since resources would immediately be destroyed and only re-created after
     // content got loaded. In this state the window content is undefined and can
     // show garbage.
     // However - the page load mechanism requires an activation call through a
     // visibility call to (re)load.
     if (visible) {
       is_or_was_visible_ = true;
       web_contents_->WasShown();
     }
     return;
   }
   if (visible) {
     if (!web_contents_->should_normally_be_visible())
       web_contents_->WasShown();
   } else {
     if (web_contents_->should_normally_be_visible())
-      web_contents_->WasHidden();
+      web_contents_->WasHidden(content_visible);
   }
 }
 
 }  // namespace content