[scheduler] Use Finch to control background throttling.

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 5cbf14d9716cbf6d33dd9445dafc71953644c31b..6edb9d6272c03adf28f8f5f49a7796371434d130 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -100,7 +100,8 @@ class WEB_EXPORT WebViewImpl final
       public RefCounted<WebViewImpl>,
       WTF_NON_EXPORTED_BASE(public WebGestureCurveTarget),
       public PageWidgetEventHandler,
-      public WebScheduler::InterventionReporter {
+      public WebScheduler::InterventionReporter,
+      public WebViewScheduler::WebViewSchedulerSettings {
  public:
   static WebViewImpl* create(WebViewClient*, WebPageVisibilityState);
   static HashSet<WebViewImpl*>& allInstances();
@@ -279,6 +280,12 @@ class WEB_EXPORT WebViewImpl final
   // WebScheduler::InterventionReporter implementation:
   void ReportIntervention(const WebString& message) override;
 
+  // WebViewScheduler::WebViewSchedulerSettings implementation:
+  float expensiveBackgroundThrottlingCPUBudget() override;
+  float expensiveBackgroundThrottlingInitialBudget() override;
+  float expensiveBackgroundThrottlingMaxBudget() override;
+  float expensiveBackgroundThrottlingMaxDelay() override;
+
   void didUpdateFullscreenSize();
 
   float defaultMinimumPageScaleFactor() const;