Force layout and invalidation for new plugin content

components/plugins/renderer/loadable_plugin_placeholder.cc

Index: components/plugins/renderer/loadable_plugin_placeholder.cc
diff --git a/components/plugins/renderer/loadable_plugin_placeholder.cc b/components/plugins/renderer/loadable_plugin_placeholder.cc
index 3719130a70f189e57fe16ef983c59acd1ee6a9e7..d259f79b495e88e359ad9ec14511e90cfe632eb0 100644
--- a/components/plugins/renderer/loadable_plugin_placeholder.cc
+++ b/components/plugins/renderer/loadable_plugin_placeholder.cc
@@ -329,6 +329,12 @@ void LoadablePluginPlaceholder::DidFinishLoadingCallback() {
   if (message_.length() > 0)
     UpdateMessage();
 
+  // Ensure that we force a layout and paint invalidation for the new
+  // content. This will cause the container invalidation to be acted upon.
+  blink::WebFrame* frame = GetFrame();
+  blink::WebView* view = frame->view();
+  view->setNeedsLayoutAndFullPaintInvalidation();
+
   // Wait for the placeholder to finish loading to hide the premade plugin.
   // This is necessary to prevent a flicker.
   if (premade_throttler_ && !placeholder_was_replaced_)