Disable scheduler deadline task on battery power in Windows

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 2ef10a481ddebc38d8dd04dd3127f911a0285bdd..9ae7671bc321e2fabfd16c942288e9e27742d2d3 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -11,6 +11,8 @@
 #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"
@@ -71,7 +73,8 @@ class CC_EXPORT 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,
@@ -83,11 +86,15 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
                                          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,
@@ -164,7 +171,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
             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!
@@ -185,6 +193,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   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_;
@@ -223,6 +233,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void OnBeginImplFrameDeadline();
   void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
+  void SetupPowerMonitoring();
+  void TeardownPowerMonitoring();
 
   base::TimeDelta EstimatedParentDrawTime() {
     return estimated_parent_draw_time_;