[scheduler] Throttle background frames with 1% CPU limit

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

Index: third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
index a4b7c679dc8ae299d214eb4aa7f35b86fd22484c..e724e46f81cead0ee9c476bf77752ea5ca1ed7d0 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
@@ -59,6 +59,15 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
   void Unregister(WebFrameSchedulerImpl* frame_scheduler);
 
  private:
+  friend class WebFrameSchedulerImpl;
+
+  bool IsAudioPlaying() const;
+
+  TaskQueueThrottler::TimeBudgetPool* background_time_budget_pool() const {
+    return background_time_budget_pool_;
+  }
+
+ private:
   void setAllowVirtualTimeToAdvance(bool allow_virtual_time_to_advance);
   void ApplyVirtualTimePolicy();
 
@@ -73,6 +82,9 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
   bool allow_virtual_time_to_advance_;
   bool have_seen_loading_task_;
   bool virtual_time_;
+  bool is_audio_playing_;
+  TaskQueueThrottler::TimeBudgetPool*
+      background_time_budget_pool_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(WebViewSchedulerImpl);
 };