[content]: Add CanExceedIdleDeadlineIfRequired function to RendererScheduler.

content/renderer/scheduler/renderer_scheduler_impl.h

Index: content/renderer/scheduler/renderer_scheduler_impl.h
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.h b/content/renderer/scheduler/renderer_scheduler_impl.h
index 1bd5d15bfa102e53e663a1bbc69188e9a830534f..409c43cdc4fbd07daf86a75e1aa95d5311b393bb 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.h
+++ b/content/renderer/scheduler/renderer_scheduler_impl.h
@@ -41,6 +41,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   void DidReceiveInputEventOnCompositorThread(
       const blink::WebInputEvent& web_input_event) override;
   void DidAnimateForInputOnCompositorThread() override;
+  bool CanExceedIdleDeadlineIfRequired() const override;
   bool IsHighPriorityWorkAnticipated() override;
   bool ShouldYieldForHighPriorityWork() override;
   void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer) override;
@@ -78,6 +79,12 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
     ACTIVE_AND_AWAITING_TOUCHSTART_RESPONSE
   };
 
+  enum class IdlePeriodState {
+    NOT_WITHIN_IDLE_PERIOD,
+    WITHIN_IDLE_PERIOD,
+    WITHIN_MAX_DEADLINE_IDLE_PERIOD
+  };
+
   class PollableNeedsUpdateFlag {
    public:
     PollableNeedsUpdateFlag(base::Lock* write_lock);
@@ -102,6 +109,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   static const char* TaskQueueIdToString(QueueId queue_id);
   static const char* PolicyToString(Policy policy);
   static const char* InputStreamStateToString(InputStreamState state);
+  static const char* IdlePeriodStateToString(IdlePeriodState state);
 
   static InputStreamState ComputeNewInputStreamState(
       InputStreamState current_state,
@@ -151,19 +159,19 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   // input was processed.
   void DidProcessInputEvent(base::TimeTicks begin_frame_time);
 
-  // Returns true if we should initiate a long idle time now. Fills in
+  // Returns the new idle period state for the next long idle period. Fills in
   // |next_long_idle_period_delay_out| with the next time we should try to
   // initiate the next idle period.
-  bool ShouldStartLongIdlePeriod(
+  IdlePeriodState ComputeNewLongIdlePeriodState(
       const base::TimeTicks now,
-      base::TimeDelta* next_long_idle_period_delay_out);
+      base::TimeDelta* next_long_idle_period_delay);
 
   // Initiate a long idle period.
   void InitiateLongIdlePeriod();
   void InitiateLongIdlePeriodAfterWakeup();
 
   // Start and end an idle period.
-  void StartIdlePeriod();
+  void StartIdlePeriod(IdlePeriodState new_idle_period_state);
   void EndIdlePeriod();
 
   base::TimeTicks Now() const;
@@ -185,7 +193,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
 
   // Don't access current_policy_ directly, instead use SchedulerPolicy().
   Policy current_policy_;
-  bool in_idle_period_;
+  IdlePeriodState idle_period_state_;
 
   base::TimeTicks estimated_next_frame_begin_;
   base::TimeTicks current_policy_expiration_time_;