Update from https://crrev.com/304121

cc/scheduler/scheduler_settings.h

Index: cc/scheduler/scheduler_settings.h
diff --git a/cc/scheduler/scheduler_settings.h b/cc/scheduler/scheduler_settings.h
index 8607991914e80979b049e00693a4ad55325722c1..e3fd4255aa30e42cf6edb5092ee21c8c912e71a9 100644
--- a/cc/scheduler/scheduler_settings.h
+++ b/cc/scheduler/scheduler_settings.h
@@ -6,6 +6,7 @@
 #define CC_SCHEDULER_SCHEDULER_SETTINGS_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
 #include "base/values.h"
 #include "cc/base/cc_export.h"
 
@@ -24,7 +25,8 @@ class CC_EXPORT SchedulerSettings {
   explicit SchedulerSettings(const LayerTreeSettings& settings);
   ~SchedulerSettings();
 
-  bool begin_frame_scheduling_enabled;
+  bool use_external_begin_frame_source;
+  bool forward_begin_frames_to_children;
   bool main_frame_before_activation_enabled;
   bool impl_side_painting;
   bool timeout_and_draw_when_animation_checkerboards;
@@ -33,6 +35,8 @@ class CC_EXPORT SchedulerSettings {
   bool throttle_frame_production;
   bool disable_hi_res_timer_tasks_on_battery;
 
+  base::TimeDelta background_frame_interval;
+
   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValue() const;
 };