Experimental: Remove chromium shared timers

content/renderer/scheduler/renderer_task_queue_selector.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_SCHEDULER_RENDERER_TASK_QUEUE_SELECTOR_H_
 #define CONTENT_RENDERER_SCHEDULER_RENDERER_TASK_QUEUE_SELECTOR_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
@@ skipping 30 matching lines @@
   RendererTaskQueueSelector();
   ~RendererTaskQueueSelector() override;
 
   // Set the priority of |queue_index| to |priority|.
   void SetQueuePriority(size_t queue_index, QueuePriority priority);
 
   // Enable the |queue_index| with a priority of |priority|. By default all
   // queues are enabled with normal priority.
   void EnableQueue(size_t queue_index, QueuePriority priority);
 
-  // Disable the |queue_index|.
-  void DisableQueue(size_t queue_index);
+  // Disable the |queue_index|. Returns true if the queue was previously enabled
+  // otherwise returns false.
+  bool DisableQueue(size_t queue_index);
 
   // Whether |queue_index| is enabled.
   bool IsQueueEnabled(size_t queue_index) const;
 
   // TaskQueueSelector implementation:
   void RegisterWorkQueues(
       const std::vector<const base::TaskQueue*>& work_queues) override;
   bool SelectWorkQueueToService(size_t* out_queue_index) override;
   void AsValueInto(base::trace_event::TracedValue* state) const override;
+  void RegisterTaskQueueObserver(TaskQueueSelectorObserver* observer) override;
 
  private:
   // Returns true if queueA contains an older task than queueB.
   static bool IsOlder(const base::TaskQueue* queueA,
                       const base::TaskQueue* queueB);
 
   // Returns the priority which is next after |priority|.
   static QueuePriority NextPriority(QueuePriority priority);
 
   static const char* PriorityToString(QueuePriority priority);
@@ skipping 14 matching lines @@
 
   // Number of high priority tasks which can be run before a normal priority
   // task should be selected to prevent starvation.
   // TODO(rmcilroy): Check if this is a good value.
   static const size_t kMaxStarvationTasks = 5;
 
   base::ThreadChecker main_thread_checker_;
   std::vector<const base::TaskQueue*> work_queues_;
   std::set<size_t> queue_priorities_[QUEUE_PRIORITY_COUNT];
   size_t starvation_count_;
+  TaskQueueSelectorObserver* task_queue_selector_observer_;  // NOT OWNED
   DISALLOW_COPY_AND_ASSIGN(RendererTaskQueueSelector);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SCHEDULER_RENDERER_TASK_QUEUE_SELECTOR_H_