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..5bfa29c0a640cfff1cab9baf9a3ba59848ea6596 100644
--- a/talk/media/webrtc/webrtcvideoengine2.h
+++ b/talk/media/webrtc/webrtcvideoengine2.h
@@ -393,6 +393,13 @@ class WebRtcVideoChannel2 : public rtc::MessageHandler,
     bool muted_ GUARDED_BY(lock_);
     VideoFormat format_ GUARDED_BY(lock_);
     int old_adapt_changes_ GUARDED_BY(lock_);
+
+    // To align the delta timestamp with rtc time

[pthatcher1, 2015/07/15 17:53:07]

I like the comment on the other value, and think this should have a similar one:

// The timestamp of the first frame received
// Used to generate the timestamps of subsequent frames

[qiangchen, 2015/07/15 19:35:22]

Done.

+    int64_t base_timestamp_ms_ GUARDED_BY(lock_);
+
+    // The timestamp of the last frame we received
+    // Used to generate timestamp for the black frame when capturer is removed
+    int64_t last_timestamp_ms_ GUARDED_BY(lock_);
   };
 
   // Wrapper for the receiver part, contains configs etc. that are needed to