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

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 8dad3e7904accddb5d06e94501e0e4fc02ede46d..652a867f2000385755dd4853a84016e64521bd18 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1087,6 +1087,10 @@ void WebContentsImpl::WasShown() {
 }
 
 void WebContentsImpl::WasHidden() {
+  WasHidden(false);
+}
+
+void WebContentsImpl::WasHidden(bool content_visible) {
   // If there are entities capturing screenshots or video (e.g., mirroring),
   // don't activate the "disable rendering" optimization.
   if (capturer_count_ == 0) {
@@ -1098,7 +1102,7 @@ void WebContentsImpl::WasHidden() {
     // calls us).
     for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
       if (view)
-        view->Hide();
+        view->Hide(content_visible);
     }
 
     // Release any video power save blockers held as video is not visible.