[scheduler] Use Finch to control background throttling.

third_party/WebKit/public/web/WebSettings.h

Index: third_party/WebKit/public/web/WebSettings.h
diff --git a/third_party/WebKit/public/web/WebSettings.h b/third_party/WebKit/public/web/WebSettings.h
index 72e7a075bd372cf2db2d0d347d00674f2976f3b6..124be313b23786c115b9df0d28732df01e4e37ea 100644
--- a/third_party/WebKit/public/web/WebSettings.h
+++ b/third_party/WebKit/public/web/WebSettings.h
@@ -289,6 +289,11 @@ class WebSettings {
   virtual void setWebSecurityEnabled(bool) = 0;
   virtual void setWideViewportQuirkEnabled(bool) = 0;
   virtual void setXSSAuditorEnabled(bool) = 0;
+  // Background timer throttling aggressiveness settings.
+  virtual void setExpensiveBackgroundThrottlingCPUBudget(float) = 0;
+  virtual void setExpensiveBackgroundThrottlingInitialBudget(float) = 0;
+  virtual void setExpensiveBackgroundThrottlingMaxBudget(float) = 0;
+  virtual void setExpensiveBackgroundThrottlingMaxDelay(float) = 0;
 
  protected:
   ~WebSettings() {}