Disable scheduler deadline task on battery power in Windows

cc/scheduler/scheduler_state_machine.h

Index: cc/scheduler/scheduler_state_machine.h
diff --git a/cc/scheduler/scheduler_state_machine.h b/cc/scheduler/scheduler_state_machine.h
index 887e4c743a34450bc1ec5013484c29cc932f4f9d..a63a683e90787692fdad05fc2ca6c229b2f342e4 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -238,6 +238,12 @@ class CC_EXPORT SchedulerStateMachine {
 
   bool CouldSendBeginMainFrame() const;
 
+  void SetImplLatencyTakesPriorityOnBattery(
+      bool impl_latency_takes_priority_on_battery) {
+    impl_latency_takes_priority_on_battery_ =
+        impl_latency_takes_priority_on_battery;
+  }
+
   // TODO(zmo): This is temporary for debugging crbug.com/393331.
   // We should remove it afterwards.
   std::string GetStatesForDebugging() const;
@@ -314,6 +320,7 @@ class CC_EXPORT SchedulerStateMachine {
   bool skip_next_begin_main_frame_to_reduce_latency_;
   bool skip_begin_main_frame_to_reduce_latency_;
   bool continuous_painting_;
+  bool impl_latency_takes_priority_on_battery_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);