Clear page display after navigation if no rendered output arrives

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index a04779a089a83550d8d2f3cd01fdcd001130680a..eb7a25388c9a886517c116957b414b7c42a8100e 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -915,6 +915,18 @@ void RenderFrameHostImpl::OnDidCommitProvisionalLoad(const IPC::Message& msg) {
   accessibility_reset_count_ = 0;
   frame_tree_node()->navigator()->DidNavigate(this, validated_params);
 
+  // For a top-level frame, there are potential security concerns associated
+  // with displaying graphics from a previously loaded page after the URL in
+  // the omnibar has been changed. It is unappealing to clear the page
+  // immediately, but if the renderer is taking a long time to issue any
+  // compositor output (possibly because of script deliberately creating this
+  // situation) then we clear it after a while anyway.
+  // See https://crbug.com/497588.
+  if (frame_tree_node_->IsMainFrame() && GetView()) {
+    RenderWidgetHostImpl::From(GetView()->GetRenderWidgetHost())
+        ->StartNewContentRenderingTimeout();
+  }
+
   // PlzNavigate
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableBrowserSideNavigation)) {