Disable scheduler deadline task on battery power in Windows

cc/scheduler/scheduler.h

 // 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.
 
 #ifndef CC_SCHEDULER_SCHEDULER_H_
 #define CC_SCHEDULER_SCHEDULER_H_
 
 #include <deque>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/power_monitor/power_observer.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/scheduler/delay_based_time_source.h"
 #include "cc/scheduler/draw_result.h"
 #include "cc/scheduler/scheduler_settings.h"
 #include "cc/scheduler/scheduler_state_machine.h"
 
 namespace base {
 namespace debug {
@@ skipping 20 matching lines @@
   virtual void DidAnticipatedDrawTimeChange(base::TimeTicks time) = 0;
   virtual base::TimeDelta DrawDurationEstimate() = 0;
   virtual base::TimeDelta BeginMainFrameToCommitDurationEstimate() = 0;
   virtual base::TimeDelta CommitToActivateDurationEstimate() = 0;
   virtual void DidBeginImplFrameDeadline() = 0;
 
  protected:
   virtual ~SchedulerClient() {}
 };
 
-class CC_EXPORT Scheduler {
+class CC_EXPORT Scheduler : public base::PowerObserver {
  public:
   static scoped_ptr<Scheduler> Create(
       SchedulerClient* client,
       const SchedulerSettings& scheduler_settings,
       int layer_tree_host_id,
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
     return make_scoped_ptr(new Scheduler(
         client, scheduler_settings, layer_tree_host_id, task_runner));
   }
 
   virtual ~Scheduler();
 
+  // base::PowerObserver method.
+  virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE;
+
   const SchedulerSettings& settings() const { return settings_; }
 
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval);
   void SetEstimatedParentDrawTime(base::TimeDelta draw_time);
 
   void SetCanStart();
 
   void SetVisible(bool visible);
   void SetCanDraw(bool can_draw);
@@ skipping 116 matching lines @@
   base::Closure poll_for_draw_triggers_closure_;
   base::Closure advance_commit_state_closure_;
   base::CancelableClosure begin_impl_frame_deadline_task_;
   base::CancelableClosure poll_for_draw_triggers_task_;
   base::CancelableClosure advance_commit_state_task_;
 
   SchedulerStateMachine state_machine_;
   bool inside_process_scheduled_actions_;
   SchedulerStateMachine::Action inside_action_;
 
+  bool on_battery_power_;

[brianderson, 2014/09/12 22:05:27]

Can you make sure this flag is included in the trace events?

[sunnyps, 2014/09/15 21:52:48]

Done.

+
   base::TimeDelta VSyncInterval() { return vsync_interval_; }
 
  private:
   base::TimeTicks AdjustedBeginImplFrameDeadline(
       const BeginFrameArgs& args,
       base::TimeDelta draw_duration_estimate) const;
   void ScheduleBeginImplFrameDeadline(base::TimeTicks deadline);
   void SetupNextBeginFrameIfNeeded();
   void PostBeginRetroFrameIfNeeded();
   void SetupNextBeginFrameWhenVSyncThrottlingEnabled(bool needs_begin_frame);
   void SetupNextBeginFrameWhenVSyncThrottlingDisabled(bool needs_begin_frame);
   void SetupPollingMechanisms(bool needs_begin_frame);
   void DrawAndSwapIfPossible();
   void ProcessScheduledActions();
   bool CanCommitAndActivateBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
   void SetupSyntheticBeginFrames();
   void BeginRetroFrame();
   void BeginUnthrottledFrame();
+  bool ShouldPostBeginImplFrameDeadline() const;
   void BeginImplFrame(const BeginFrameArgs& args);
   void OnBeginImplFrameDeadline();
   void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
+  void SetupPowerMonitoring();
+  void TeardownPowerMonitoring();
 
   base::TimeDelta EstimatedParentDrawTime() {
     return estimated_parent_draw_time_;
   }
 
   bool IsInsideAction(SchedulerStateMachine::Action action) {
     return inside_action_ == action;
   }
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_