[reference - do not submit] Always create four pools in TaskSchedulerImpl.

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 3cab7f96cdc120e1e84ad3d35c433553150d84e7..2bbc411da17a3eeb9f5b91a8f993c6ca49a63d43 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -222,6 +222,11 @@ GURL ContentRendererClient::OverrideFlashEmbedWithHTML(const GURL& url) {
   return GURL();
 }
 
+std::unique_ptr<base::TaskSchedulerInitParams>
+ContentRendererClient::GetTaskSchedulerInitParams() {
+  return nullptr;
+}
+
 bool ContentRendererClient::AllowMediaSuspend() {
   return true;
 }