Make SingleThreadProxy a SchedulerClient

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 88501a97cd9c5d1541088e4727a9798a6fdfbfd8..d97ad4f602bb62f424d62b5c359f0c0497a6ddb7 100644
--- a/cc/scheduler/scheduler_settings.cc
+++ b/cc/scheduler/scheduler_settings.cc
@@ -4,6 +4,8 @@
 
 #include "cc/scheduler/scheduler_settings.h"
 
+#include "cc/trees/layer_tree_settings.h"
+
 namespace cc {
 
 SchedulerSettings::SchedulerSettings()
@@ -14,6 +16,17 @@ SchedulerSettings::SchedulerSettings()
       throttle_frame_production(true),
       switch_to_low_latency_if_possible(false) {}
 
+SchedulerSettings::SchedulerSettings(const LayerTreeSettings& settings)
+    : impl_side_painting(settings.impl_side_painting),
+      timeout_and_draw_when_animation_checkerboards(
+          settings.timeout_and_draw_when_animation_checkerboards),
+      maximum_number_of_failed_draws_before_draw_is_forced_(
+          settings.maximum_number_of_failed_draws_before_draw_is_forced_),
+      using_synchronous_renderer_compositor(
+          settings.using_synchronous_renderer_compositor),
+      throttle_frame_production(settings.throttle_frame_production),
+      switch_to_low_latency_if_possible(false) {}
+
 SchedulerSettings::~SchedulerSettings() {}
 
 }  // namespace cc