Add support for writing raw encoder output to .ivf files.

webrtc/modules/video_coding/video_receiver_unittest.cc

Index: webrtc/modules/video_coding/video_receiver_unittest.cc
diff --git a/webrtc/modules/video_coding/video_receiver_unittest.cc b/webrtc/modules/video_coding/video_receiver_unittest.cc
index 05656a5c2541147a65285a37cd3ad7e30364df54..3c414053bc2843c0834423625b0d039a632cf24c 100644
--- a/webrtc/modules/video_coding/video_receiver_unittest.cc
+++ b/webrtc/modules/video_coding/video_receiver_unittest.cc
@@ -33,7 +33,7 @@ class TestVideoReceiver : public ::testing::Test {
   TestVideoReceiver() : clock_(0) {}
 
   virtual void SetUp() {
-    receiver_.reset(new VideoReceiver(&clock_, &event_factory_));
+    receiver_.reset(new VideoReceiver(&clock_, &event_factory_, nullptr));
     receiver_->RegisterExternalDecoder(&decoder_, kUnusedPayloadType);
     const size_t kMaxNackListSize = 250;
     const int kMaxPacketAgeToNack = 450;