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 3b300b6e4f774eeb75b2580c72714c9d6a11a20d..6cc6d343d01f4b3d24c1cde8826b594c4b4221e7 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1091,6 +1091,10 @@ 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) {
@@ -1102,7 +1106,7 @@ 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.