cc: Add SwapAck watchdog.

cc/scheduler/scheduler_settings.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/scheduler/scheduler_settings.h"
 
 #include "base/trace_event/trace_event_argument.h"
 
 namespace cc {
 
 SchedulerSettings::SchedulerSettings()
     : use_external_begin_frame_source(false),
       main_frame_while_swap_throttled_enabled(false),
       main_frame_before_activation_enabled(false),
       commit_to_active_tree(false),
       timeout_and_draw_when_animation_checkerboards(true),
       using_synchronous_renderer_compositor(false),
       throttle_frame_production(true),
       abort_commit_before_output_surface_creation(true),
       maximum_number_of_failed_draws_before_draw_is_forced(3),
-      background_frame_interval(base::TimeDelta::FromSeconds(1)) {}
+      background_frame_interval(base::TimeDelta::FromSeconds(1)),
+      swap_ack_watchdog_enabled(false) {}
 
 SchedulerSettings::SchedulerSettings(const SchedulerSettings& other) = default;
 
 SchedulerSettings::~SchedulerSettings() {}
 
 std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
 SchedulerSettings::AsValue() const {
   std::unique_ptr<base::trace_event::TracedValue> state(
       new base::trace_event::TracedValue());
   state->SetBoolean("use_external_begin_frame_source",
                     use_external_begin_frame_source);
   state->SetBoolean("main_frame_while_swap_throttled_enabled",
                     main_frame_while_swap_throttled_enabled);
   state->SetBoolean("main_frame_before_activation_enabled",
                     main_frame_before_activation_enabled);
   state->SetBoolean("commit_to_active_tree", commit_to_active_tree);
   state->SetBoolean("timeout_and_draw_when_animation_checkerboards",
                     timeout_and_draw_when_animation_checkerboards);
   state->SetInteger("maximum_number_of_failed_draws_before_draw_is_forced",
                     maximum_number_of_failed_draws_before_draw_is_forced);
   state->SetBoolean("using_synchronous_renderer_compositor",
                     using_synchronous_renderer_compositor);
   state->SetBoolean("throttle_frame_production", throttle_frame_production);
   state->SetInteger("background_frame_interval",
                     background_frame_interval.InMicroseconds());
   state->SetBoolean("abort_commit_before_output_surface_creation",
                     abort_commit_before_output_surface_creation);
+  state->SetBoolean("swap_ack_watchdog_enabled", swap_ack_watchdog_enabled);
   return std::move(state);
 }
 
 }  // namespace cc