Lower the priority of shared workers

content/browser/worker_host/worker_service_impl.h

Index: content/browser/worker_host/worker_service_impl.h
diff --git a/content/browser/worker_host/worker_service_impl.h b/content/browser/worker_host/worker_service_impl.h
index 845f4334191b6124ba8da945e3f42b1303ed3f1b..a81d134648e94cf3917f2985f43b08ddac20c807 100644
--- a/content/browser/worker_host/worker_service_impl.h
+++ b/content/browser/worker_host/worker_service_impl.h
@@ -11,6 +11,7 @@
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "content/browser/worker_host/worker_process_host.h"
+#include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/worker_service.h"
 
@@ -21,6 +22,7 @@ namespace content {
 class ResourceContext;
 class WorkerServiceObserver;
 class WorkerStoragePartition;
+class WorkerPrioritySetter;
 
 class CONTENT_EXPORT WorkerServiceImpl
     : public NON_EXPORTED_BASE(WorkerService) {
@@ -28,6 +30,9 @@ class CONTENT_EXPORT WorkerServiceImpl
   // Returns the WorkerServiceImpl singleton.
   static WorkerServiceImpl* GetInstance();
 
+  // Releases the priority setter to avoid memory leak error.
+  void PerformTeardownForTesting();
+
   // WorkerService implementation:
   virtual bool TerminateWorker(int process_id, int route_id) OVERRIDE;
   virtual std::vector<WorkerInfo> GetWorkers() OVERRIDE;
@@ -72,6 +77,8 @@ class CONTENT_EXPORT WorkerServiceImpl
       WorkerProcessHost* process,
       int worker_route_id);
 
+  void NotifyWorkerProcessCreated();
+
   // Used when we run each worker in a separate process.
   static const int kMaxWorkersWhenSeparate;
   static const int kMaxWorkersPerTabWhenSeparate;
@@ -122,7 +129,8 @@ class CONTENT_EXPORT WorkerServiceImpl
       const WorkerStoragePartition& worker_partition,
       ResourceContext* resource_context);
 
-  NotificationRegistrar registrar_;
+  scoped_refptr<WorkerPrioritySetter> priority_setter_;
+
   int next_worker_route_id_;
 
   WorkerProcessHost::Instances queued_workers_;