Update from https://crrev.com/304121

cc/scheduler/scheduler_settings.cc

Index: cc/scheduler/scheduler_settings.cc
diff --git a/cc/scheduler/scheduler_settings.cc b/cc/scheduler/scheduler_settings.cc
index ab9add087bd9f32bca15c18081d18688ac1d4d9c..84f0fcdbe0c02b21a485af59519320166c033f35 100644
--- a/cc/scheduler/scheduler_settings.cc
+++ b/cc/scheduler/scheduler_settings.cc
@@ -10,18 +10,22 @@
 namespace cc {
 
 SchedulerSettings::SchedulerSettings()
-    : begin_frame_scheduling_enabled(true),
+    : use_external_begin_frame_source(false),
+      forward_begin_frames_to_children(false),
       main_frame_before_activation_enabled(false),
       impl_side_painting(false),
       timeout_and_draw_when_animation_checkerboards(true),
       maximum_number_of_failed_draws_before_draw_is_forced_(3),
       using_synchronous_renderer_compositor(false),
       throttle_frame_production(true),
-      disable_hi_res_timer_tasks_on_battery(false) {
+      disable_hi_res_timer_tasks_on_battery(false),
+      background_frame_interval(base::TimeDelta::FromSeconds(1)) {
 }
 
 SchedulerSettings::SchedulerSettings(const LayerTreeSettings& settings)
-    : begin_frame_scheduling_enabled(settings.begin_frame_scheduling_enabled),
+    : use_external_begin_frame_source(settings.use_external_begin_frame_source),
+      forward_begin_frames_to_children(
+          settings.forward_begin_frames_to_children),
       main_frame_before_activation_enabled(
           settings.main_frame_before_activation_enabled),
       impl_side_painting(settings.impl_side_painting),
@@ -33,7 +37,9 @@ SchedulerSettings::SchedulerSettings(const LayerTreeSettings& settings)
           settings.using_synchronous_renderer_compositor),
       throttle_frame_production(settings.throttle_frame_production),
       disable_hi_res_timer_tasks_on_battery(
-          settings.disable_hi_res_timer_tasks_on_battery) {
+          settings.disable_hi_res_timer_tasks_on_battery),
+      background_frame_interval(base::TimeDelta::FromSecondsD(
+          1.0 / settings.background_animation_rate)) {
 }
 
 SchedulerSettings::~SchedulerSettings() {}
@@ -42,8 +48,10 @@ scoped_refptr<base::debug::ConvertableToTraceFormat>
 SchedulerSettings::AsValue() const {
   scoped_refptr<base::debug::TracedValue> state =
       new base::debug::TracedValue();
-  state->SetBoolean("begin_frame_scheduling_enabled",
-                    begin_frame_scheduling_enabled);
+  state->SetBoolean("use_external_begin_frame_source",
+                    use_external_begin_frame_source);
+  state->SetBoolean("forward_begin_frames_to_children",
+                    forward_begin_frames_to_children);
   state->SetBoolean("main_frame_before_activation_enabled",
                     main_frame_before_activation_enabled);
   state->SetBoolean("impl_side_painting", impl_side_painting);
@@ -56,6 +64,8 @@ SchedulerSettings::AsValue() const {
   state->SetBoolean("throttle_frame_production", throttle_frame_production);
   state->SetBoolean("disable_hi_res_timer_tasks_on_battery",
                     disable_hi_res_timer_tasks_on_battery);
+  state->SetInteger("background_frame_interval",
+                    background_frame_interval.InMicroseconds());
   return state;
 }