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..8c49677f270cf0de6b5cb870f7ed4fc6eeffe420 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -835,6 +835,18 @@ void RenderFrameHostImpl::OnDidCommitProvisionalLoad(const IPC::Message& msg) {
     OnBeforeUnloadACK(true, approx_renderer_start_time, base::TimeTicks::Now());
   }
 
+  // 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();
+  }
+
   // If we're waiting for an unload ack from this renderer and we receive a
   // Navigate message, then the renderer was navigating before it received the
   // unload request.  It will either respond to the unload request soon or our