cc: Add SwapAck watchdog.

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index 66d1c48976a4b9a427e20aaa924bb60095e2108a..cf315c93e60704cc22032e6c9e7902f5035a017d 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -66,6 +66,7 @@ bool LayerTreeSettings::operator==(const LayerTreeSettings& other) const {
              other.main_frame_before_activation_enabled &&
          using_synchronous_renderer_compositor ==
              other.using_synchronous_renderer_compositor &&
+         swap_ack_watchdog_enabled == other.swap_ack_watchdog_enabled &&
          can_use_lcd_text == other.can_use_lcd_text &&
          use_distance_field_text == other.use_distance_field_text &&
          gpu_rasterization_enabled == other.gpu_rasterization_enabled &&
@@ -130,6 +131,7 @@ void LayerTreeSettings::ToProtobuf(proto::LayerTreeSettings* proto) const {
       main_frame_before_activation_enabled);
   proto->set_using_synchronous_renderer_compositor(
       using_synchronous_renderer_compositor);
+  proto->set_swap_ack_watchdog_enabled(swap_ack_watchdog_enabled);
   proto->set_can_use_lcd_text(can_use_lcd_text);
   proto->set_use_distance_field_text(use_distance_field_text);
   proto->set_gpu_rasterization_enabled(gpu_rasterization_enabled);
@@ -188,6 +190,7 @@ void LayerTreeSettings::FromProtobuf(const proto::LayerTreeSettings& proto) {
       proto.main_frame_before_activation_enabled();
   using_synchronous_renderer_compositor =
       proto.using_synchronous_renderer_compositor();
+  swap_ack_watchdog_enabled = proto.swap_ack_watchdog_enabled();
   can_use_lcd_text = proto.can_use_lcd_text();
   use_distance_field_text = proto.use_distance_field_text();
   gpu_rasterization_enabled = proto.gpu_rasterization_enabled();
@@ -252,6 +255,7 @@ SchedulerSettings LayerTreeSettings::ToSchedulerSettings() const {
       base::TimeDelta::FromSecondsD(1.0 / background_animation_rate);
   scheduler_settings.abort_commit_before_output_surface_creation =
       abort_commit_before_output_surface_creation;
+  scheduler_settings.swap_ack_watchdog_enabled = swap_ack_watchdog_enabled;
   return scheduler_settings;
 }