[content] Expose renderer scheduler task queues in content::RenderThread.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index d51fe69dcc6a00e002ab87a5f47d2cd09e2e0ce9..150a01192a36e3dc934e91f6c5beb33587a9ae48 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1502,6 +1502,16 @@ int32_t RenderThreadImpl::GetClientId() {
   return client_id_;
 }
 
+scoped_refptr<base::SingleThreadTaskRunner>
+RenderThreadImpl::GetTimerTaskRunner() {
+  return renderer_scheduler_->TimerTaskRunner();
+}
+
+scoped_refptr<base::SingleThreadTaskRunner>
+RenderThreadImpl::GetLoadingTaskRunner() {
+  return renderer_scheduler_->LoadingTaskRunner();
+}
+
 void RenderThreadImpl::OnAssociatedInterfaceRequest(
     const std::string& name,
     mojo::ScopedInterfaceEndpointHandle handle) {