Flip this back to true. IdleHandlers should certainly be being scheduled when

content/public/renderer/content_renderer_client.cc

Index: content/public/renderer/content_renderer_client.cc
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
index 221e241b42d7c6b90382e1d683722f081e5c653b..6ca2fcc772f96929fa3eaf545932a7e219b65012 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -85,9 +85,7 @@ blink::WebSpeechSynthesizer* ContentRendererClient::OverrideSpeechSynthesizer(
 }
 
 bool ContentRendererClient::RunIdleHandlerWhenWidgetsHidden() {
-  // TODO(wfh): http://crbug.com/381820 change this back to true after testing
-  // whether this affects tabs hanging.
-  return false;
+  return true;
 }
 
 bool ContentRendererClient::AllowPopup() {