[scheduler] Support adding one queue to multiple budget pools

third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h

 // Copyright 2015 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 THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_TASK_QUEUE_THROTTLER_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_TASK_QUEUE_THROTTLER_H_
 
 #include <set>
 #include <unordered_map>
 
@@ skipping 127 matching lines @@
 
   // Accounts for given task for cpu-based throttling needs.
   void OnTaskRunTimeReported(TaskQueue* task_queue,
                              base::TimeTicks start_time,
                              base::TimeTicks end_time);
 
   void AsValueInto(base::trace_event::TracedValue* state,
                    base::TimeTicks now) const;
  private:
   struct Metadata {
-    Metadata() : throttling_ref_count(0), budget_pool(nullptr) {}
+    Metadata() : throttling_ref_count(0) {}
 
     size_t throttling_ref_count;
 
-    BudgetPool* budget_pool;
+    std::unordered_set<BudgetPool*> budget_pools;
   };
   using TaskQueueMap = std::unordered_map<TaskQueue*, Metadata>;
 
   void PumpThrottledTasks();
 
   // Note |unthrottled_runtime| might be in the past. When this happens we
   // compute the delay to the next runtime based on now rather than
   // unthrottled_runtime.
   void MaybeSchedulePumpThrottledTasks(
       const tracked_objects::Location& from_here,
       base::TimeTicks now,
       base::TimeTicks runtime);
 
-  BudgetPool* GetBudgetPoolForQueue(TaskQueue* queue);
-
   // Return next possible time when queue is allowed to run in accordance
   // with throttling policy.
   base::TimeTicks GetNextAllowedRunTime(base::TimeTicks now, TaskQueue* queue);
 
   void MaybeDeleteQueueMetadata(TaskQueueMap::iterator it);
 
   // Schedule a call PumpThrottledTasks at an appropriate moment for this queue.
   void SchedulePumpQueue(const tracked_objects::Location& from_here,
                          base::TimeTicks now,
                          TaskQueue* queue);
@@ skipping 14 matching lines @@
 
   base::WeakPtrFactory<TaskQueueThrottler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueueThrottler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_TASK_QUEUE_THROTTLER_H_