[cc] Don't send missed BeginFrames with past deadline.

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 <memory>
 #include <string>
 
@@ skipping 38 matching lines @@
   void SetActive(bool active);
   bool Active() const;
 
   // Get the last and next tick times. NextTickTime() returns null when
   // inactive.
   base::TimeTicks LastTickTime() const;
   base::TimeTicks NextTickTime() const;
 
   virtual void AsValueInto(base::trace_event::TracedValue* dict) const;
 
+  // Virtual for testing.
+  virtual base::TimeTicks Now() const;
+
  protected:
   // Virtual for testing.
-  virtual base::TimeTicks Now() const;
   virtual std::string TypeString() const;
 
  private:
   void PostNextTickTask(base::TimeTicks now);
   void ResetTickTask(base::TimeTicks now);
 
   void OnTimerTick();
 
   DelayBasedTimeSourceClient* client_;
 
@@ skipping 10 matching lines @@
   base::SingleThreadTaskRunner* task_runner_;
 
   base::WeakPtrFactory<DelayBasedTimeSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DelayBasedTimeSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_DELAY_BASED_TIME_SOURCE_H_