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

cc/scheduler/delay_based_time_source.h

Index: cc/scheduler/delay_based_time_source.h
diff --git a/cc/scheduler/delay_based_time_source.h b/cc/scheduler/delay_based_time_source.h
index a4fb79118e86cc9eaac627463d7b8f503348c1db..d15b4608328abee7998124a026c2a1581a9c2b07 100644
--- a/cc/scheduler/delay_based_time_source.h
+++ b/cc/scheduler/delay_based_time_source.h
@@ -56,9 +56,11 @@ class CC_EXPORT DelayBasedTimeSource {
 
   virtual void AsValueInto(base::trace_event::TracedValue* dict) const;
 
- protected:
   // Virtual for testing.
   virtual base::TimeTicks Now() const;
+
+ protected:
+  // Virtual for testing.
   virtual std::string TypeString() const;
 
  private: