[scheduler] Use Finch to control background throttling.

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 f7d1da38a65107ddc919971e4b51edc347435fd5..36523f9f9b305e7cb270ad0c7cc73166272c1928 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
@@ -32,6 +32,7 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
  public:
   WebViewSchedulerImpl(
       WebScheduler::InterventionReporter* intervention_reporter,
+      WebScheduler::WebSchedulerSettings* settings,
       RendererSchedulerImpl* renderer_scheduler,
       bool disable_background_timer_throttling);
 
@@ -63,11 +64,9 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
  private:
   friend class WebFrameSchedulerImpl;
 
-  TaskQueueThrottler::TimeBudgetPool* background_time_budget_pool() const {
-    return background_time_budget_pool_;
-  }
+  TaskQueueThrottler::TimeBudgetPool* BackgroundTimeBudgetPool();
+  void MaybeInitializeBackgroundTimeBudgetPool();
 
- private:
   void setAllowVirtualTimeToAdvance(bool allow_virtual_time_to_advance);
   void ApplyVirtualTimePolicy();
 
@@ -85,6 +84,7 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
   bool is_audio_playing_;
   TaskQueueThrottler::TimeBudgetPool*
       background_time_budget_pool_;  // Not owned.
+  WebScheduler::WebSchedulerSettings* settings_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(WebViewSchedulerImpl);
 };