Stop disabling force_compositing_mode for background RenderViews.

extensions/browser/extension_host.cc

Index: extensions/browser/extension_host.cc
diff --git a/extensions/browser/extension_host.cc b/extensions/browser/extension_host.cc
index 0eac1fbbf30b12e227cdc6c143db6f2423bec3a5..899e504d717ef5dfebc2931d107acb0a01b4c2e1 100644
--- a/extensions/browser/extension_host.cc
+++ b/extensions/browser/extension_host.cc
@@ -427,4 +427,9 @@ void ExtensionHost::RequestMediaAccessPermission(
       web_contents, request, callback, extension());
 }
 
+bool ExtensionHost::IsNeverVisible(content::WebContents* web_contents) {
+  ViewType view_type = extensions::GetViewType(web_contents);
+  return view_type == extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE;
+}
+
 }  // namespace extensions