[scheduler] Throttle background frames with 1% CPU limit

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_THROTTLING_HELPER_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 
 #include <set>
 #include <unordered_map>
 
@@ skipping 180 matching lines @@
         : throttling_ref_count(ref_count),
           enabled(is_enabled),
           time_budget_pool(nullptr) {}
 
     size_t throttling_ref_count;
     bool enabled;
 
     TimeBudgetPool* time_budget_pool;
 
     bool IsThrottled() const { return throttling_ref_count > 0; }
+
+    void SetQueueEnabled(TaskQueue* task_queue);
   };
   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,
@@ skipping 32 matching lines @@
 
   base::WeakPtrFactory<TaskQueueThrottler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueueThrottler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_H_