Throttle rendering pipeline for invisible iframes

components/test_runner/web_test_proxy.cc

Index: components/test_runner/web_test_proxy.cc
diff --git a/components/test_runner/web_test_proxy.cc b/components/test_runner/web_test_proxy.cc
index 456a41fbad44aac25b7d48cb88fb96ae2a020512..1a1633b1ce08422e8619d5e7b4ca06bb1476f406 100644
--- a/components/test_runner/web_test_proxy.cc
+++ b/components/test_runner/web_test_proxy.cc
@@ -769,9 +769,11 @@ void WebTestProxyBase::AnimateNow() {
     animate_scheduled_ = false;
     web_widget_->beginFrame(args);
     web_widget_->layout();
+    web_widget_->didCommitCompositorFrame();
     if (blink::WebPagePopup* popup = web_widget_->pagePopup()) {
       popup->beginFrame(args);
       popup->layout();
+      popup->didCommitCompositorFrame();
     }
   }
 }