FrameBuffer for the new jitter buffer.

BUG=webrtc:5514
R=danilchap@webrtc.org, mflodman@webrtc.org

Review URL: https://codereview.webrtc.org/1969403007 .

Cr-Commit-Position: refs/heads/master@{#12798}

webrtc/modules/video_coding/timing.h

@@ -28,7 +28,7 @@ class VCMTiming {
   // The primary timing component should be passed
   // if this is the dual timing component.
   explicit VCMTiming(Clock* clock, VCMTiming* master_timing = NULL);
-  ~VCMTiming();
+  virtual ~VCMTiming();
 
   // Resets the timing to the initial state.
   void Reset();
@@ -69,11 +69,11 @@ class VCMTiming {
   // Returns the receiver system time when the frame with timestamp
   // frame_timestamp should be rendered, assuming that the system time currently
   // is now_ms.
-  int64_t RenderTimeMs(uint32_t frame_timestamp, int64_t now_ms) const;
+  virtual int64_t RenderTimeMs(uint32_t frame_timestamp, int64_t now_ms) const;
 
   // Returns the maximum time in ms that we can wait for a frame to become
   // complete before we must pass it to the decoder.
-  uint32_t MaxWaitingTime(int64_t render_time_ms, int64_t now_ms) const;
+  virtual uint32_t MaxWaitingTime(int64_t render_time_ms, int64_t now_ms) const;
 
   // Returns the current target delay which is required delay + decode time +
   // render delay.