Refactoring the way begin frame sources inside scheduler work.

cc/scheduler/delay_based_time_source.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_DELAY_BASED_TIME_SOURCE_H_
 #define CC_SCHEDULER_DELAY_BASED_TIME_SOURCE_H_
 
+#include <string>
+
 #include "base/memory/weak_ptr.h"
+#include "base/values.h"
 #include "cc/base/cc_export.h"
 #include "cc/scheduler/time_source.h"
 
 namespace base { class SingleThreadTaskRunner; }
 
 namespace cc {
 
 // This timer implements a time source that achieves the specified interval
 // in face of millisecond-precision delayed callbacks and random queueing
 // delays. DelayBasedTimeSource uses base::TimeTicks::Now as its timebase.
 class CC_EXPORT DelayBasedTimeSource : public TimeSource {
  public:
   static scoped_refptr<DelayBasedTimeSource> Create(
       base::TimeDelta interval, base::SingleThreadTaskRunner* task_runner);
 
   virtual void SetClient(TimeSourceClient* client) OVERRIDE;
 
   // TimeSource implementation
   virtual void SetTimebaseAndInterval(base::TimeTicks timebase,
                                       base::TimeDelta interval) OVERRIDE;
 
   virtual base::TimeTicks SetActive(bool active) OVERRIDE;
   virtual bool Active() const OVERRIDE;
 
   // Get the last and next tick times. NextTickTime() returns null when
   // inactive.
-  virtual base::TimeTicks LastTickTime() OVERRIDE;
-  virtual base::TimeTicks NextTickTime() OVERRIDE;
+  virtual base::TimeTicks LastTickTime() const OVERRIDE;
+  virtual base::TimeTicks NextTickTime() const OVERRIDE;
 
   // Virtual for testing.
   virtual base::TimeTicks Now() const;
 
+  virtual scoped_ptr<base::Value> AsValue() const;
+
  protected:
   DelayBasedTimeSource(base::TimeDelta interval,
                        base::SingleThreadTaskRunner* task_runner);
   virtual ~DelayBasedTimeSource();
 
+  virtual std::string TypeString() const;
+
   base::TimeTicks NextTickTarget(base::TimeTicks now);
   void PostNextTickTask(base::TimeTicks now);
   void OnTimerFired();
 
   struct Parameters {
     Parameters(base::TimeDelta interval, base::TimeTicks tick_target)
         : interval(interval), tick_target(tick_target) {}
     base::TimeDelta interval;
     base::TimeTicks tick_target;
   };
@@ skipping 23 matching lines @@
   static scoped_refptr<DelayBasedTimeSourceHighRes> Create(
         base::TimeDelta interval, base::SingleThreadTaskRunner* task_runner);
 
   virtual base::TimeTicks Now() const OVERRIDE;
 
  protected:
   DelayBasedTimeSourceHighRes(base::TimeDelta interval,
                               base::SingleThreadTaskRunner* task_runner);
   virtual ~DelayBasedTimeSourceHighRes();
 
+  virtual std::string TypeString() const OVERRIDE;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(DelayBasedTimeSourceHighRes);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_DELAY_BASED_TIME_SOURCE_H_