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

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index da9af68e420cdc09215582c10653ba5f9c4bb620..0c3d7ba93b4c8a4cbffd9e2b20c8b8c063f8fa8b 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -1610,15 +1610,17 @@ int WebContentsViewAura::OnPerformDrop(const ui::DropTargetEvent& event) {
 }
 
 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
@@ -1637,7 +1639,7 @@ void WebContentsViewAura::UpdateWebContentsVisibility(bool visible) {
       web_contents_->WasShown();
   } else {
     if (web_contents_->should_normally_be_visible())
-      web_contents_->WasHidden();
+      web_contents_->WasHidden(content_visible);
   }
 }