[scheduler] Support adding one queue to multiple budget pools

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

Index: third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h b/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h
index 1cbab9da797f597abc994bd0a9bb2bfcc6de4be0..b68ec07b976200e3c40e54ad08ed2f32b4d41282 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h
@@ -145,11 +145,11 @@ class BLINK_PLATFORM_EXPORT TaskQueueThrottler : public TimeDomain::Observer,
                    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>;
 
@@ -163,8 +163,6 @@ class BLINK_PLATFORM_EXPORT TaskQueueThrottler : public TimeDomain::Observer,
       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);