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..670c86d7224762cd06a2f043fee7a5ee5e28600c 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"
 
@@ -23,11 +24,13 @@ class WorkerServiceObserver;
 class WorkerStoragePartition;
 
 class CONTENT_EXPORT WorkerServiceImpl
-    : public NON_EXPORTED_BASE(WorkerService) {
+    : public NON_EXPORTED_BASE(WorkerService),
+      public content::NotificationObserver {

[jam, 2013/05/09 18:02:57]

no "content::" since this is in the content namespace

[shatch, 2013/05/09 22:42:49]

Done.

  public:
   // Returns the WorkerServiceImpl singleton.
   static WorkerServiceImpl* GetInstance();
 
+

[jam, 2013/05/09 18:02:57]

nit: remove

[shatch, 2013/05/09 22:42:49]

Done.

   // WorkerService implementation:
   virtual bool TerminateWorker(int process_id, int route_id) OVERRIDE;
   virtual std::vector<WorkerInfo> GetWorkers() OVERRIDE;
@@ -72,6 +75,8 @@ 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;
@@ -122,6 +127,30 @@ class CONTENT_EXPORT WorkerServiceImpl
       const WorkerStoragePartition& worker_partition,
       ResourceContext* resource_context);
 
+  // Registers as an observer to receive notifications about
+  // widgets being shown.
+  void RegisterObserver();
+
+  // Called to refresh worker priorities when focus changes between tabs.
+  void OnRenderWidgetVisibilityChanged(std::pair<int, int>);
+
+  // Sets priorities for shared workers given a set of visible tabs (as a
+  // std::set of std::pair<render_process, render_view> ids.
+  void UpdateWorkerPrioritiesFromVisibleSet(
+      const std::set<std::pair<int, int> >* visible);
+
+  // Gathers up a list of the visible tabs and then priorities for
+  // all the shared workers.
+  void GatherVisibleIDsAndUpdateWorkerPriorities();
+
+  // Posts a task to perform a worker priority update.
+  void PostTaskToGatherAndUpdateWorkerPriorities();
+
+  // NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
+
   NotificationRegistrar registrar_;
   int next_worker_route_id_;