Introduce RtpStreamReceiver and RtpStreamReceiverControllerInterface.

webrtc/call/flexfec_receive_stream_unittest.cc

Index: webrtc/call/flexfec_receive_stream_unittest.cc
diff --git a/webrtc/call/flexfec_receive_stream_unittest.cc b/webrtc/call/flexfec_receive_stream_unittest.cc
index 46bd7c382cd2e920e2853404b88ac9f3e491f7a6..5b625fc12890d2c0a7d914d9ce1e7ada65fb4146 100644
--- a/webrtc/call/flexfec_receive_stream_unittest.cc
+++ b/webrtc/call/flexfec_receive_stream_unittest.cc
@@ -27,6 +27,7 @@ namespace webrtc {
 
 namespace {
 
+#if 0
 constexpr uint8_t kFlexfecPlType = 118;
 constexpr uint8_t kFlexfecSsrc[] = {0x00, 0x00, 0x00, 0x01};
 constexpr uint8_t kMediaSsrc[] = {0x00, 0x00, 0x00, 0x02};
@@ -47,6 +48,7 @@ RtpPacketReceived ParsePacket(rtc::ArrayView<const uint8_t> packet) {
   EXPECT_TRUE(parsed_packet.Parse(packet));
   return parsed_packet;
 }
+#endif
 
 }  // namespace
 
@@ -73,6 +75,7 @@ TEST(FlexfecReceiveStreamConfigTest, IsCompleteAndEnabled) {
   EXPECT_FALSE(config.IsCompleteAndEnabled());
 }
 
+#if 0
 class FlexfecReceiveStreamTest : public ::testing::Test {
  protected:
   FlexfecReceiveStreamTest()
@@ -147,5 +150,6 @@ TEST_F(FlexfecReceiveStreamTest, RecoversPacketWhenStarted) {
       OnRecoveredPacket(::testing::_, kRtpHeaderSize + kPayloadLength[1]));
   receive_stream.OnRtpPacket(ParsePacket(kFlexfecPacket));
 }
+#endif
 
 }  // namespace webrtc