Add Timestamp accessor methods to the EncodedImage class.

Bug: webrtc:9378
Change-Id: I59bf14f631f92f0f4e05f60d4af25641a23a53f9
Reviewed-on: https://webrtc-review.googlesource.com/82100
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23734}

common_video/include/video_frame.h

@@ -37,6 +37,14 @@ class EncodedImage {
   EncodedImage(const EncodedImage&);
   EncodedImage(uint8_t* buffer, size_t length, size_t size);
 
+  // TODO(nisse): Change style to timestamp(), set_timestamp(), for consistency
+  // with the VideoFrame class.
+  // Set frame timestamp (90kHz).
+  void SetTimestamp(uint32_t timestamp) { _timeStamp = timestamp; }
+
+  // Get frame timestamp (90kHz).
+  uint32_t Timestamp() const { return _timeStamp; }
+
   void SetEncodeTime(int64_t encode_start_ms, int64_t encode_finish_ms);
 
   uint32_t _encodedWidth = 0;