Adding support for simulcast and spatial layers into VideoQualityTest

webrtc/test/layer_filtering_transport.h

Index: webrtc/test/layer_filtering_transport.h
diff --git a/webrtc/test/layer_filtering_transport.h b/webrtc/test/layer_filtering_transport.h
index 96a2cba8a232c44f43b72978b024b9d311ddaabd..d36788356077a0d01d5a7329ee2c9c4e19c425fa 100644
--- a/webrtc/test/layer_filtering_transport.h
+++ b/webrtc/test/layer_filtering_transport.h
@@ -13,6 +13,8 @@
 #include "webrtc/test/direct_transport.h"
 #include "webrtc/test/fake_network_pipe.h"
 
+#include <map>
+
 namespace webrtc {
 
 namespace test {
@@ -22,19 +24,23 @@ class LayerFilteringTransport : public test::DirectTransport {
   LayerFilteringTransport(const FakeNetworkPipe::Config& config,
                           uint8_t vp8_video_payload_type,
                           uint8_t vp9_video_payload_type,
-                          uint8_t tl_discard_threshold,
-                          uint8_t sl_discard_threshold);
+                          int selected_tl,
+                          int selected_sl);
+  bool DiscardedLastPacket() const;
   bool SendRtp(const uint8_t* data, size_t length) override;
 
  private:
+  uint16_t NextSequenceNumber(uint32_t ssrc);
+
   // Used to distinguish between VP8 and VP9.
   const uint8_t vp8_video_payload_type_;
   const uint8_t vp9_video_payload_type_;
-  // Discard all temporal/spatial layers with id greater or equal the
-  // threshold. 0 to disable.
-  const uint8_t tl_discard_threshold_;
-  const uint8_t sl_discard_threshold_;
-  uint16_t current_seq_num_;
+  // Discard or invalidate all temporal/spatial layers with id greater than the
+  // selected one. -1 to disable filtering.
+  const int selected_tl_;
+  const int selected_sl_;
+  std::map<uint32_t, uint16_t> current_seq_nums_;
+  bool discarded_last_packet_;
 };
 
 }  // namespace test