Implement timestamp translation/filter in VideoCapturer.

webrtc/media/base/videocapturer_unittest.cc

Index: webrtc/media/base/videocapturer_unittest.cc
diff --git a/webrtc/media/base/videocapturer_unittest.cc b/webrtc/media/base/videocapturer_unittest.cc
index 25230b5118a80517ff861d5bb473019f58528332..c17aac0d898569da6ef2f8565b722cc148dd4c21 100644
--- a/webrtc/media/base/videocapturer_unittest.cc
+++ b/webrtc/media/base/videocapturer_unittest.cc
@@ -15,6 +15,7 @@
 
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/logging.h"
+#include "webrtc/base/random.h"
 #include "webrtc/base/thread.h"
 #include "webrtc/media/base/fakevideocapturer.h"
 #include "webrtc/media/base/fakevideorenderer.h"
@@ -55,6 +56,7 @@ class VideoCapturerTest
     capture_state_ = capture_state;
     ++num_state_changes_;
   }
+
   cricket::CaptureState capture_state() { return capture_state_; }
   int num_state_changes() { return num_state_changes_; }