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_monitor.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/output/vsync_parameter_observer.h"
 #include "cc/scheduler/begin_frame_source.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"
 
@@ skipping 40 matching lines @@
   virtual BeginFrameSource* ConstructPrimaryFrameSource(Scheduler* scheduler);
   virtual BeginFrameSource* ConstructBackgroundFrameSource(
       Scheduler* scheduler);
 
  protected:
   SchedulerFrameSourcesConstructor() {}
 
   friend class Scheduler;
 };
 
-class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
+class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
+                            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) {
     SchedulerFrameSourcesConstructor frame_sources_constructor;
     return make_scoped_ptr(new Scheduler(client,
                                          scheduler_settings,
                                          layer_tree_host_id,
                                          task_runner,
-                                         &frame_sources_constructor));
+                                         &frame_sources_constructor,
+                                         base::PowerMonitor::Get()));

[danakj, 2014/10/15 15:42:26]

I think brian meant that you'd pass it to Create() which would forward it to the
constructor. We don't usually do anything inside Create() except forward
parameters.

   }
 
   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 56 matching lines @@
   }
 
   // BeginFrameObserverMixin
   virtual bool OnBeginFrameMixInDelegate(const BeginFrameArgs& args) override;
 
  protected:
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,
             int layer_tree_host_id,
             const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-            SchedulerFrameSourcesConstructor* frame_sources_constructor);
+            SchedulerFrameSourcesConstructor* frame_sources_constructor,
+            base::PowerMonitor* power_monitor);
 
   // virtual for testing - Don't call these in the constructor or
   // destructor!
   virtual base::TimeTicks Now() const;
 
   scoped_ptr<BeginFrameSourceMultiplexer> frame_source_;
   BeginFrameSource* primary_frame_source_;
   BeginFrameSource* background_frame_source_;
 
   // Storage when frame sources are internal
   scoped_ptr<BeginFrameSource> primary_frame_source_internal_;
   scoped_ptr<SyntheticBeginFrameSource> background_frame_source_internal_;
 
   VSyncParameterObserver* vsync_observer_;
 
   const SchedulerSettings settings_;
   SchedulerClient* client_;
   int layer_tree_host_id_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
+  base::PowerMonitor* power_monitor_;
+
   base::TimeDelta estimated_parent_draw_time_;
 
   bool begin_retro_frame_posted_;
   std::deque<BeginFrameArgs> begin_retro_frame_args_;
   BeginFrameArgs begin_impl_frame_args_;
 
   base::Closure begin_retro_frame_closure_;
   base::Closure begin_unthrottled_frame_closure_;
 
   base::Closure begin_impl_frame_deadline_closure_;
@@ skipping 18 matching lines @@
   void DrawAndSwapIfPossible();
   void ProcessScheduledActions();
   bool CanCommitAndActivateBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
   void BeginRetroFrame();
   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_;
 
   friend class SchedulerFrameSourcesConstructor;
   friend class TestSchedulerFrameSourcesConstructor;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_