Fire visibilityChange event on out-of-process iframes.

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 bfdda50f69c982a5208572a106e7b34157cfed2d..9f89d3b443310d6f16c6c9b70ecf359c903d2c19 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1311,6 +1311,8 @@ void WebContentsImpl::WasShown() {
     }
   }
 
+  SendPageMessage(new PageMsg_WasShown(MSG_ROUTING_NONE));

[Charlie Reis, 2016/06/06 23:15:09]

Is the order of this method important?  It looks arbitrary at first glance, so
maybe mention if this needs to happen before or after the other things.

[lfg, 2016/06/08 20:00:22]

The order is not important right now (and I don't think it should ever be
important). We could swap the order and everything should still work.

+
   last_active_time_ = base::TimeTicks::Now();
 
   // The resize rect might have changed while this was inactive -- send the new
@@ -1340,6 +1342,8 @@ void WebContentsImpl::WasHidden() {
       if (view)
         view->Hide();
     }
+
+    SendPageMessage(new PageMsg_WasHidden(MSG_ROUTING_NONE));
   }
 
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, WasHidden());