Add more out of line copy ctors for complex classes.

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 5b2bbf1c041bfde088198b9e395de830c76cc38e..79576acc1a4238a4082528032be03d654f35d110 100644
--- a/cc/scheduler/scheduler_settings.cc
+++ b/cc/scheduler/scheduler_settings.cc
@@ -20,6 +20,8 @@ SchedulerSettings::SchedulerSettings()
       maximum_number_of_failed_draws_before_draw_is_forced(3),
       background_frame_interval(base::TimeDelta::FromSeconds(1)) {}
 
+SchedulerSettings::SchedulerSettings(const SchedulerSettings& other) = default;
+
 SchedulerSettings::~SchedulerSettings() {}
 
 scoped_ptr<base::trace_event::ConvertableToTraceFormat>