Let WebRtcVideoChannel2::WebRtcVideoSendStream::InputFrame carry the input frame's timestamp to out…

talk/media/webrtc/webrtcvideoengine2.h

Index: talk/media/webrtc/webrtcvideoengine2.h
diff --git a/talk/media/webrtc/webrtcvideoengine2.h b/talk/media/webrtc/webrtcvideoengine2.h
index e30597584000c7198dc1e693b0fbefce3258ce95..2cbebf81d6304008289666f579defcf953a76640 100644
--- a/talk/media/webrtc/webrtcvideoengine2.h
+++ b/talk/media/webrtc/webrtcvideoengine2.h
@@ -393,6 +393,14 @@ class WebRtcVideoChannel2 : public rtc::MessageHandler,
     bool muted_ GUARDED_BY(lock_);
     VideoFormat format_ GUARDED_BY(lock_);
     int old_adapt_changes_ GUARDED_BY(lock_);
+
+    // The timestamp of the first frame received
+    // Used to generate the timestamps of subsequent frames
+    int64_t first_frame_timestamp_ms_ GUARDED_BY(lock_);
+
+    // The timestamp of the last frame received
+    // Used to generate timestamp for the black frame when capturer is removed
+    int64_t last_frame_timestamp_ms_ GUARDED_BY(lock_);
   };
 
   // Wrapper for the receiver part, contains configs etc. that are needed to