Auto instantiate RBE depending on whether AST or TOF is available in incoming packet stream.

BUG=
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5409004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5293 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/interface/module_common_types.h

@@ -28,7 +28,9 @@
 namespace webrtc {
 
 struct RTPHeaderExtension {
+  bool hasTransmissionTimeOffset;
   int32_t transmissionTimeOffset;
+  bool hasAbsoluteSendTime;
   uint32_t absoluteSendTime;
 };