Disable scheduler deadline task on battery power in Windows

cc/scheduler/scheduler.cc

 // Copyright 2011 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.h"
 
 #include <algorithm>
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_argument.h"
@@ skipping 55 matching lines @@
                                         scheduler->Now(),
                                         base::TimeDelta::FromSeconds(1));
   return scheduler->background_frame_source_internal_.get();
 }
 
 Scheduler::Scheduler(
     SchedulerClient* client,
     const SchedulerSettings& scheduler_settings,
     int layer_tree_host_id,
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+    base::PowerMonitor* power_monitor,
     SchedulerFrameSourcesConstructor* frame_sources_constructor)
     : frame_source_(),
       primary_frame_source_(NULL),
       background_frame_source_(NULL),
       primary_frame_source_internal_(),
       background_frame_source_internal_(),
       vsync_observer_(NULL),
       settings_(scheduler_settings),
       client_(client),
       layer_tree_host_id_(layer_tree_host_id),
       task_runner_(task_runner),
+      power_monitor_(power_monitor),
       begin_retro_frame_posted_(false),
       state_machine_(scheduler_settings),
       inside_process_scheduled_actions_(false),
       inside_action_(SchedulerStateMachine::ACTION_NONE),
       weak_factory_(this) {
   TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler"),
                "Scheduler::Scheduler",
                "settings",
                settings_.AsValue());
   DCHECK(client_);
@@ skipping 13 matching lines @@
 
   // Primary frame source
   primary_frame_source_ =
       frame_sources_constructor->ConstructPrimaryFrameSource(this);
   frame_source_->AddSource(primary_frame_source_);
 
   // Background ticking frame source
   background_frame_source_ =
       frame_sources_constructor->ConstructBackgroundFrameSource(this);
   frame_source_->AddSource(background_frame_source_);
+
+  SetupPowerMonitoring();
 }
 
 Scheduler::~Scheduler() {
+  TeardownPowerMonitoring();
 }
 
 base::TimeTicks Scheduler::Now() const {
   base::TimeTicks now = gfx::FrameTime::Now();
   TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.now"),
                "Scheduler::Now",
                "now",
                now);
   return now;
 }
 
+void Scheduler::SetupPowerMonitoring() {
+  if (settings_.disable_hi_res_timer_tasks_on_battery) {
+    DCHECK(power_monitor_);
+    power_monitor_->AddObserver(this);
+    state_machine_.SetImplLatencyTakesPriorityOnBattery(
+        power_monitor_->IsOnBatteryPower());
+  }
+}
+
+void Scheduler::TeardownPowerMonitoring() {
+  if (settings_.disable_hi_res_timer_tasks_on_battery) {
+    DCHECK(power_monitor_);
+    power_monitor_->RemoveObserver(this);
+  }
+}
+
+void Scheduler::OnPowerStateChange(bool on_battery_power) {
+  DCHECK(settings_.disable_hi_res_timer_tasks_on_battery);
+  state_machine_.SetImplLatencyTakesPriorityOnBattery(on_battery_power);
+}
+
 void Scheduler::CommitVSyncParameters(base::TimeTicks timebase,
                                       base::TimeDelta interval) {
   // TODO(brianderson): We should not be receiving 0 intervals.
   if (interval == base::TimeDelta())
     interval = BeginFrameArgs::DefaultInterval();
 
   if (vsync_observer_)
     vsync_observer_->OnUpdateVSyncParameters(timebase, interval);
 }
 
@@ skipping 602 matching lines @@
 }
 
 bool Scheduler::IsBeginMainFrameSentOrStarted() const {
   return (state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT ||
           state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED);
 }
 
 }  // namespace cc