Use microsecond timestamp in cricket::VideoFrame.

webrtc/media/base/videocapturer.h

Index: webrtc/media/base/videocapturer.h
diff --git a/webrtc/media/base/videocapturer.h b/webrtc/media/base/videocapturer.h
index 270315582a1c1e497be3072eb94e5958aa511457..b0965a559bfed2bc022d217b995804f0a663fad6 100644
--- a/webrtc/media/base/videocapturer.h
+++ b/webrtc/media/base/videocapturer.h
@@ -294,6 +294,10 @@ class VideoCapturer : public sigslot::has_slots<>,
   bool enable_video_adapter_;
   VideoAdapter video_adapter_;
 
+  // Same value as input_size_valid_ below, but different locking.

[perkj_webrtc, 2016/04/08 08:22:49]

?

[nisse-webrtc, 2016/04/08 09:15:43]

Both timestamp_offset_valid and input_size_valid have the same meaning: Have we
seen the first frame yet? But we can't really use a shared flag, because the
timestamp offset logic shouldn't touch the frame_stats_crit_ lock.

Anyway, this is moot if the logic is moved to the frame factory.

+  bool timestamp_offset_valid_ = false;
+  int64_t timestamp_offset_;
+
   rtc::CriticalSection frame_stats_crit_;
   // The captured frame size before potential adapation.
   bool input_size_valid_ GUARDED_BY(frame_stats_crit_) = false;