Fixing and enhancing OrderedSimpleTaskRunner to allow 100% deterministic tests.

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>
 
@@ skipping 119 matching lines @@
   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValue() const;
 
   void SetContinuousPainting(bool continuous_painting) {
     state_machine_.SetContinuousPainting(continuous_painting);
   }
 
  protected:
   class CC_EXPORT SyntheticBeginFrameSource : public TimeSourceClient {
    public:
     SyntheticBeginFrameSource(Scheduler* scheduler,
-                              base::SingleThreadTaskRunner* task_runner);
+                              scoped_refptr<DelayBasedTimeSource> time_source);
     virtual ~SyntheticBeginFrameSource();
 
     // Updates the phase and frequency of the timer.
     void CommitVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval);
 
     // Activates future BeginFrames and, if activating, pushes the most
     // recently missed BeginFrame to the back of a retroactive queue.
     void SetNeedsBeginFrame(bool needs_begin_frame,
                             std::deque<BeginFrameArgs>* begin_retro_frame_args);
@@ skipping 10 matching lines @@
 
     Scheduler* scheduler_;
     scoped_refptr<DelayBasedTimeSource> time_source_;
   };
 
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,
             int layer_tree_host_id,
             const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
+  virtual base::TimeTicks Now() const;
+
   const SchedulerSettings settings_;
   SchedulerClient* client_;
   int layer_tree_host_id_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   base::TimeDelta vsync_interval_;
   base::TimeDelta estimated_parent_draw_time_;
 
   bool last_set_needs_begin_frame_;
   bool begin_unthrottled_frame_posted_;
@@ skipping 10 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_;
 
+  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();
   void BeginImplFrame(const BeginFrameArgs& args);
   void OnBeginImplFrameDeadline();
   void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
 
-  base::TimeDelta VSyncInterval() { return vsync_interval_; }
-
   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_