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>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/begin_frame_args.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"
+#include "ui/gfx/frame_time.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace cc {
 
 class SchedulerClient {
  public:
   virtual void SetNeedsBeginFrame(bool enable) = 0;
@@ skipping 138 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>& impl_task_runner);
 
+  virtual base::TimeTicks Now() const;
+  virtual void SetupSyntheticBeginFrames();
+
   const SchedulerSettings settings_;
   SchedulerClient* client_;
   int layer_tree_host_id_;
   scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner_;
 
   base::TimeDelta vsync_interval_;
   base::TimeDelta estimated_parent_draw_time_;
 
   bool last_set_needs_begin_frame_;
   bool begin_unthrottled_frame_posted_;
@@ skipping 25 matching lines @@
   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();
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_