Add functions to ViE API to enable/disable the absolute send time header extension.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1487004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4065 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/vie_rtp_rtcp_impl.h b/video_engine/vie_rtp_rtcp_impl.h
index fb8bd54..9af4b0c 100644
--- a/video_engine/vie_rtp_rtcp_impl.h
+++ b/video_engine/vie_rtp_rtcp_impl.h
@@ -82,6 +82,12 @@
   virtual int SetReceiveTimestampOffsetStatus(int video_channel,
                                               bool enable,
                                               int id);
+  virtual int SetSendAbsoluteSendTimeStatus(int video_channel,
+                                            bool enable,
+                                            int id);
+  virtual int SetReceiveAbsoluteSendTimeStatus(int video_channel,
+                                               bool enable,
+                                               int id);
   virtual int SetTransmissionSmoothingStatus(int video_channel, bool enable);
   virtual int GetReceivedRTCPStatistics(const int video_channel,
                                         uint16_t& fraction_lost,